build(deps): bump langchain-text-splitters in /python/graphy

Bumps [langchain-text-splitters](https://github.com/langchain-ai/langchain) from 0.2.0 to 0.3.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-text-splitters==0.2.0...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]

python/graphy/requirements.txt

@@ -16,7 +16,7 @@ langchain-experimental==0.0.60
 langchain-google-vertexai==1.0.4
 langchain-huggingface==0.0.3
 langchain-openai==0.1.8
-langchain-text-splitters==0.2.0
+langchain-text-splitters==0.3.9
 numpy==1.26.4
 Pillow>=10.3.0
 psutil==6.1.0