chore: bump langgraph-sdk from 0.3.13 to 0.3.15 in /libs/langchain (#38475)

Bumps [langgraph-sdk](https://github.com/langchain-ai/langgraph) from
0.3.13 to 0.3.15.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/langchain-ai/langgraph/releases">langgraph-sdk's
releases</a>.</em></p>
<blockquote>
<h2>langgraph-sdk==0.3.15</h2>
<p>Changes since sdk==0.3.14</p>
<ul>
<li>release(checkpoint): 4.1.1 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7890">#7890</a>)</li>
<li>release(sdk-py): 0.3.15 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7891">#7891</a>)</li>
<li>fix(sdk-py): percent-encode caller-supplied identifiers in URL paths
(<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7893">#7893</a>)</li>
<li>release(langgraph): 1.2.1 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7883">#7883</a>)</li>
<li>chore(deps): bump idna from 3.11 to 3.15 in /libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7863">#7863</a>)</li>
<li>chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7764">#7764</a>)</li>
<li>chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7789">#7789</a>)</li>
<li>release: bump alpha packages to official versions (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7775">#7775</a>)</li>
<li>chore(langgraph): bump langchain-core to 1.4.0 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7767">#7767</a>)</li>
<li>feat(sdk-py): support metadata filter for crons search/count (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7737">#7737</a>)</li>
<li>chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7666">#7666</a>)</li>
</ul>
<h2>langgraph-sdk==0.3.14</h2>
<p>Changes since sdk==0.3.13</p>
<ul>
<li>release(sdk-py): 0.3.14 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7712">#7712</a>)</li>
<li>feat(sdk-py): add return_minimal to threads update (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7704">#7704</a>)</li>
<li>release: alpha bump (a4) for langgraph, checkpoint,
checkpoint-postgres (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7701">#7701</a>)</li>
<li>release: alpha bump langgraph 1.2.0a6 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7697">#7697</a>)</li>
<li>release: alpha bump prebuilt 1.1.0a2, langgraph 1.2.0a5 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7682">#7682</a>)</li>
<li>release: alpha bump prebuilt 1.1.0a1, langgraph 1.2.0a4 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7679">#7679</a>)</li>
<li>feat(langgraph): dispatch stream_events(version='v3') on Pregel (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7677">#7677</a>)</li>
<li>release: alpha bump (a3) for langgraph, checkpoint,
checkpoint-postgres (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7678">#7678</a>)</li>
<li>release: alpha for timers (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7647">#7647</a>)</li>
<li>chore: update x links to langchain_oss (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7645">#7645</a>)</li>
<li>feat(langgraph): add streaming transformer infrastructure and tests
(<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7519">#7519</a>)</li>
<li>chore(deps): bump the minor-and-patch group across 1 directory with
4 updates (ty held back) (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7635">#7635</a>)</li>
<li>release(prebuilt): 1.0.12, langgraph 1.1.10 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7623">#7623</a>)</li>
<li>release(checkpoint): 4.0.3 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7625">#7625</a>)</li>
<li>release(prebuilt): 1.0.11 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7610">#7610</a>)</li>
<li>feat(prebuilt): allow ToolNode tools to return list[Command |
ToolMessage] (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7596">#7596</a>)</li>
<li>chore(langgraph): bump version 1.1.8 -&gt; 1.1.9 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7563">#7563</a>)</li>
<li>release(langgraph): 1.1.8 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7545">#7545</a>)</li>
<li>release(prebuilt): 1.0.10 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7541">#7541</a>)</li>
<li>release(langgraph): 1.1.7 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7540">#7540</a>)</li>
<li>chore(deps): bump langsmith from 0.7.20 to 0.7.31 in /libs/sdk-py
(<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7528">#7528</a>)</li>
<li>release(checkpoint): 4.0.2 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7518">#7518</a>)</li>
<li>chore(deps-dev): bump pytest from 9.0.2 to 9.0.3 in /libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7504">#7504</a>)</li>
<li>release(langgraph): 1.1.7a2 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7511">#7511</a>)</li>
<li>chore: allow passing some metadata only for tracing purposes (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7383">#7383</a>)</li>
<li>release(langgraph): 1.1.7a1 (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7476">#7476</a>)</li>
<li>chore(deps): bump langchain-core from 1.2.22 to 1.2.28 in
/libs/sdk-py (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/7449">#7449</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="e1aa1a4510"><code>e1aa1a4</code></a>
0.3.15</li>
<li><a
href="7a959f62cc"><code>7a959f6</code></a>
Fix assertion</li>
<li><a
href="9b5549f759"><code>9b5549f</code></a>
Fix flaky assertion</li>
<li><a
href="fa96c0ac76"><code>fa96c0a</code></a>
One more</li>
<li><a
href="98b8ff904c"><code>98b8ff9</code></a>
Update test assertions for triggers</li>
<li><a
href="951131c8ec"><code>951131c</code></a>
Lint</li>
<li><a
href="8bcdba822e"><code>8bcdba8</code></a>
Reduce to 4.1s</li>
<li><a
href="60fc49b448"><code>60fc49b</code></a>
Speed up prepare_single_task</li>
<li><a
href="1d21b4ba08"><code>1d21b4b</code></a>
Improve prepare_single_task trigger checks to linear complexity (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/3891">#3891</a>)</li>
<li><a
href="55ec0d3d2a"><code>55ec0d3</code></a>
Speed up task triggers check (<a
href="https://redirect.github.com/langchain-ai/langgraph/issues/3890">#3890</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/langchain-ai/langgraph/compare/0.3.13...0.3.15">compare
view</a></li>
</ul>
</details>
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