build(deps): bump drf-yasg from 1.21.11 to 1.21.14 in /backend

Bumps [drf-yasg](https://github.com/axnsan12/drf-yasg) from 1.21.11 to 1.21.14.
- [Release notes](https://github.com/axnsan12/drf-yasg/releases)
- [Changelog](https://github.com/axnsan12/drf-yasg/blob/master/docs/changelog.rst)
- [Commits](axnsan12/drf-yasg@1.21.11...1.21.14)

---
updated-dependencies:
- dependency-name: drf-yasg
  dependency-version: 1.21.14
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -3,7 +3,7 @@ django-cors-headers==4.9.0
 django-environ==0.12.0
 djangorestframework==3.16.1
 dockerflow==2024.4.2
-drf-yasg==1.21.11
+drf-yasg==1.21.14
 gunicorn==23.0.0
 parsepatch==0.1.3
 psycopg2-binary==2.9.11