fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-6809379

requirements.txt

@@ -30,7 +30,7 @@ GitPython==2.1.15
 
 humanize==0.5.1
 impyla==0.16.0
-jinja2==2.11.3
+jinja2==3.1.4
 #kazoo==2.2.1
 ldif3==3.2.2
 #MarkupSafe==0.23