chore(deps): bump langchain-text-splitters from 0.3.8 to 0.3.9

Bumps [langchain-text-splitters](https://github.com/langchain-ai/langchain) from 0.3.8 to 0.3.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-text-splitters==0.3.8...langchain-text-splitters==0.3.9)

---
updated-dependencies:
- dependency-name: langchain-text-splitters
  dependency-version: 0.3.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/base.txt

@@ -7,7 +7,7 @@ langchain-experimental==0.3.4
 langchain-openai==0.3.27
 langchain-pinecone==0.2.11
 langchain-tests==0.3.20
-langchain-text-splitters==0.3.8
+langchain-text-splitters==0.3.9
 langchainhub==0.1.21
 langsmith==0.4.9
 openai==1.98.0