build(deps): bump validators from 0.33.0 to 0.34.0 in /backend

Bumps [validators](https://github.com/python-validators/validators) from 0.33.0 to 0.34.0.
- [Release notes](https://github.com/python-validators/validators/releases)
- [Changelog](https://github.com/python-validators/validators/blob/master/CHANGES.md)
- [Commits](https://github.com/python-validators/validators/compare/0.33.0...0.34.0)

---
updated-dependencies:
- dependency-name: validators
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/requirements.txt

@@ -67,7 +67,7 @@ pandas==2.2.3
 openpyxl==3.1.5
 pyxlsb==1.0.10
 xlrd==2.0.1
-validators==0.33.0
+validators==0.34.0
 psutil
 sentencepiece
 soundfile==0.12.1