chore(deps): bump the python group in /backend with 2 updates

Bumps the python group in /backend with 2 updates: [drf-writable-nested](https://github.com/beda-software/drf-writable-nested) and [whitenoise](https://github.com/evansd/whitenoise).


Updates `drf-writable-nested` from 0.7.0 to 0.7.1
- [Release notes](https://github.com/beda-software/drf-writable-nested/releases)
- [Changelog](https://github.com/beda-software/drf-writable-nested/blob/master/CHANGELOG.md)
- [Commits](beda-software/drf-writable-nested@v0.7.0...v0.7.1)

Updates `whitenoise` from 6.7.0 to 6.8.2
- [Changelog](https://github.com/evansd/whitenoise/blob/main/docs/changelog.rst)
- [Commits](evansd/whitenoise@6.7.0...6.8.2)

---
updated-dependencies:
- dependency-name: drf-writable-nested
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
- dependency-name: whitenoise
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
...

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

backend/requirements.txt

@@ -33,7 +33,7 @@ djangorestframework==3.15.2
     #   djangorestframework-simplejwt
 djangorestframework-simplejwt==5.3.1
     # via -r requirements.in
-drf-writable-nested==0.7.0
+drf-writable-nested==0.7.1
     # via -r requirements.in
 gunicorn==23.0.0
     # via -r requirements.in
@@ -69,7 +69,7 @@ tzlocal==5.0.1
     # via apscheduler
 urllib3==2.2.3
     # via -r requirements.in
-whitenoise==6.7.0
+whitenoise==6.8.2
     # via -r requirements.in
 
 # The following packages are considered to be unsafe in a requirements file: