Bump pyjwt in /backend in the uv group across 1 directory

Bumps the uv group with 1 update in the /backend directory: [pyjwt](https://github.com/jpadilla/pyjwt).


Updates `pyjwt` from 2.12.1 to 2.13.0
- [Release notes](https://github.com/jpadilla/pyjwt/releases)
- [Changelog](https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.rst)
- [Commits](jpadilla/pyjwt@2.12.1...2.13.0)

---
updated-dependencies:
- dependency-name: pyjwt
  dependency-version: 2.13.0
  dependency-type: direct:production
...

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Author: dependabot[bot]