fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-8456315
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-8456316

requirements.txt

@@ -22,7 +22,7 @@ coreschema==0.0.4
 coverage==6.3.2
 Deprecated==1.2.13
 dill==0.3.4
-Django==4.1.5
+Django==4.2.17
 django-autocomplete-light==3.9.4
 django-axes==5.32.0
 django-background-tasks==1.2.5