fix: requirements.txt to reduce vulnerabilities (#91)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-7886958
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-7886959

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

requirements.txt

@@ -1,7 +1,7 @@
 dj-database-url==1.2.0
 django-allauth==0.54.0
 django-rest-auth==0.9.5
-Django==3.2.18
+Django==4.2.16
 djangorestframework==3.12.4
 gunicorn==20.0.4
 psycopg2-binary==2.9.5