Bump transformers in /financial/vector-mcp-ai-agents

Bumps [transformers](https://github.com/huggingface/transformers) from 4.36.0 to 4.53.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.36.0...v4.53.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 4.53.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

financial/vector-mcp-ai-agents/requirements_backend.txt

@@ -19,7 +19,7 @@ pandas>=2.2.0
 
 # Optional AI/ML dependencies
 torch==2.1.0
-transformers==4.36.0
+transformers==4.53.0
 openai==1.3.8
 
 # Logging and utilities