Bump langchain-text-splitters from 0.3.7 to 1.0.0a1

Bumps [langchain-text-splitters](https://github.com/langchain-ai/langchain) from 0.3.7 to 1.0.0a1.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-text-splitters==0.3.7...langchain-text-splitters==1.0.0a1)

---
updated-dependencies:
- dependency-name: langchain-text-splitters
  dependency-version: 1.0.0a1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -37,7 +37,7 @@ langchain-core==0.3.49
 langchain-google-genai==2.0.10
 langchain-ollama==0.2.2
 langchain-openai==0.3.1
-langchain-text-splitters==0.3.7
+langchain-text-splitters==1.0.0a1
 langsmith==0.3.22
 markdownify==0.14.1
 mcp==1.6.0