Update langchain-mcp-adapters requirement

Updates the requirements on [langchain-mcp-adapters](https://github.com/langchain-ai/langchain-mcp-adapters) to permit the latest version.
- [Release notes](https://github.com/langchain-ai/langchain-mcp-adapters/releases)
- [Commits](langchain-ai/langchain-mcp-adapters@langchain-mcp-adapters==0.0.3...langchain-mcp-adapters==0.2.1)

---
updated-dependencies:
- dependency-name: langchain-mcp-adapters
  dependency-version: 0.2.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

topic/machine-learning/langchain/requirements.txt

@@ -2,7 +2,7 @@ crash
 cratedb-about==0.0.9
 google-cloud-aiplatform<2
 langchain-cratedb<0.1.2
-langchain-mcp-adapters<0.2
+langchain-mcp-adapters<0.3
 langchain-google-vertexai<4
 langchain-openai<1.2
 langchain-text-splitters<1.2