Bump requests from 2.31.0 to 2.32.4 in /backend (#2)

Bumps [requests](https://github.com/psf/requests) from 2.31.0 to 2.32.4.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.31.0...v2.32.4)

---
updated-dependencies:
- dependency-name: requests
  dependency-version: 2.32.4
  dependency-type: direct:production
...

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Author: dependabot[bot]

backend/requirements.txt

@@ -17,7 +17,7 @@ nemoguardrails>=0.10.0
 
 # HTTP and parsing
 httpx>=0.27.0
-requests==2.31.0
+requests==2.32.4
 beautifulsoup4==4.12.2
 lxml==4.9.3