infra[patch]: Use langchain core in-tree as a dev dependency (#13957)

Using the published version means master is broken for contributors
whenever we make changes in one lib that depend on the other.

libs/langchain/poetry.lock

@@ -4178,16 +4178,18 @@ version = "0.0.6"
 description = "Building applications with LLMs through composability"
 optional = false
 python-versions = ">=3.8.1,<4.0"
-files = [
-    {file = "langchain_core-0.0.6-py3-none-any.whl", hash = "sha256:dcc727ff811159e09fc1d72caae4aaea892611349d5c3fc1c18b3a19573faf27"},
-    {file = "langchain_core-0.0.6.tar.gz", hash = "sha256:cffd1031764d838ad2a2f3f64477b710923ddad58eb9fe3130ff94b3669e8dd8"},
-]
+files = []
+develop = true
 
 [package.dependencies]
-jsonpatch = ">=1.33,<2.0"
-langsmith = ">=0.0.63,<0.1.0"
+jsonpatch = "^1.33"
+langsmith = "~0.0.63"
 pydantic = ">=1,<3"
-tenacity = ">=8.1.0,<9.0.0"
+tenacity = "^8.1.0"
+
+[package.source]
+type = "directory"
+url = "../core"
 
 [[package]]
 name = "langkit"
@@ -11194,4 +11196,4 @@ text-helpers = ["chardet"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "d57493dcdb7c864d71aa43463a57491f0c9cbd8fa8674d21c0b11117e8d7ea67"
+content-hash = "d049735bc75655dbdda59770b6f5b2fe9fe3c1985c75e3ad662f0863158f1e7b"

libs/langchain/pyproject.toml

@@ -165,6 +165,7 @@ pytest-mock  = "^3.10.0"
 pytest-socket = "^0.6.0"
 syrupy = "^4.0.2"
 requests-mock = "^1.11.0"
+langchain-core = {path = "../core", develop = true}
 
 
 [tool.poetry.group.codespell.dependencies]

libs/langchain/tests/unit_tests/test_dependencies.py

@@ -74,6 +74,7 @@ def test_test_group_dependencies(poetry_conf: Mapping[str, Any]) -> None:
         [
             "duckdb-engine",
             "freezegun",
+            "langchain-core",
             "lark",
             "pandas",
             "pytest",