fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-5932095

requirements.txt

@@ -10,7 +10,7 @@ chardet==3.0.4
 click==7.1.1
 decorator==4.4.2
 distlib==0.3.0
-Django==3.2.0
+Django==3.2.22
 django-environ==0.4.5
 entrypoints==0.3
 filelock==3.0.12