chore(deps): bump langchain-experimental from 0.3.4 to 0.4.1

Bumps [langchain-experimental](https://github.com/langchain-ai/langchain-experimental) from 0.3.4 to 0.4.1.
- [Release notes](https://github.com/langchain-ai/langchain-experimental/releases)
- [Commits](langchain-ai/langchain-experimental@libs/experimental/v0.3.4...libs/experimental/v0.4.1)

---
updated-dependencies:
- dependency-name: langchain-experimental
  dependency-version: 0.4.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/base.txt

@@ -3,7 +3,7 @@ isort==6.0.1
 langchain==0.3.27
 langchain-community==0.4.1
 langchain-core==1.1.0
-langchain-experimental==0.3.4
+langchain-experimental==0.4.1
 langchain-openai==1.1.6
 langchain-pinecone==0.2.12
 langchain-tests==1.0.2