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
...

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

Author: dependabot[bot]

requirements.txt

@@ -118,7 +118,7 @@ langchain-core==0.3.68
 langchain-google-genai==2.0.10
 langchain-mistralai==0.2.10
 langchain-openai==0.3.27
-langchain-text-splitters==0.3.8
+langchain-text-splitters==0.3.9
 langsmith==0.4.4
 lark==1.2.2
 launchpadlib==1.10.16