build(deps): bump django from 4.2 to 4.2.1 in /backend (#1703)

Bumps [django](https://github.com/django/django) from 4.2 to 4.2.1.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/4.2...4.2.1)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/requirements.txt

@@ -1,6 +1,6 @@
 -e ../tools #egg=code-review-tools
 dj-database-url==2.0.0
-Django==4.2
+Django==4.2.1
 django-cors-headers==3.14.0
 djangorestframework==3.14.0
 dockerflow==2022.8.0