[community][fix] Compatibility support to bump up wikibase-rest-api-client version (#27316)

**Description:**

This PR addresses the `TypeError: sequence item 0: expected str
instance, FluentValue found` error when invoking `WikidataQueryRun`. The
root cause was an incompatible version of the
`wikibase-rest-api-client`, which caused the tool to fail when handling
`FluentValue` objects instead of strings.

The current implementation only supports `wikibase-rest-api-client<0.2`,
but the latest version is `0.2.1`, where the current implementation
breaks. Additionally, the error message advises users to install the
latest version: [code
reference](https://github.com/langchain-ai/langchain/blob/master/libs/community/langchain_community/utilities/wikidata.py#L125C25-L125C32).
Therefore, this PR updates the tool to support the latest version of
`wikibase-rest-api-client`.

Key changes:
- Updated the handling of `FluentValue` objects to ensure compatibility
with the latest `wikibase-rest-api-client`.
- Removed the restriction to `wikibase-rest-api-client<0.2` and updated
to support the latest version (`0.2.1`).

**Issue:**

Fixes [#24093](https://github.com/langchain-ai/langchain/issues/24093) –
`TypeError: sequence item 0: expected str instance, FluentValue found`.

**Dependencies:**

- Upgraded `wikibase-rest-api-client` to the latest version to resolve
the issue.

---------

Co-authored-by: peiwen_zhang <peiwen_zhang@email.com>
Co-authored-by: Erick Friis <erick@langchain.dev>
Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/community/langchain_community/utilities/wikidata.py

@@ -147,7 +147,9 @@ class WikidataAPIWrapper(BaseModel):
             doc_lines.append(f"Aliases: {', '.join(resp.aliases)}")
         for prop, values in resp.statements.items():
             if values:
-                doc_lines.append(f"{prop.label}: {', '.join(values)}")
+                doc_lines.append(
+                    f"{prop.label}: {', '.join([v.value or 'unknown' for v in values])}"
+                )
 
         return Document(
             page_content=("\n".join(doc_lines))[: self.doc_content_chars_max],