Bump djangorestframework-simplejwt from 5.2.2 to 5.3.0 in /backend

Bumps [djangorestframework-simplejwt](https://github.com/jazzband/djangorestframework-simplejwt) from 5.2.2 to 5.3.0.
- [Release notes](https://github.com/jazzband/djangorestframework-simplejwt/releases)
- [Changelog](https://github.com/jazzband/djangorestframework-simplejwt/blob/master/CHANGELOG.md)
- [Commits](jazzband/djangorestframework-simplejwt@v5.2.2...v5.3.0)

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

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

backend/requirements.txt

@@ -31,7 +31,7 @@ djangorestframework==3.14.0
     # via
     #   -r requirements.in
     #   djangorestframework-simplejwt
-djangorestframework-simplejwt==5.2.2
+djangorestframework-simplejwt==5.3.0
     # via -r requirements.in
 drf-writable-nested==0.7.0
     # via -r requirements.in