fix: dev-requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-6150717

Author: snyk-bot

dev-requirements.txt

@@ -5,7 +5,7 @@ pytest-cov==2.12.1
 yaenv==1.4.1
 click==8.0.1
 rich==10.4.0
-jinja2==3.0.1
+jinja2==3.1.3
 ruamel.yaml==0.17.10
 docker==5.0.0
 dockerpty==0.4.1