fix: backend_app/requirements.macos.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-8548181
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-8548987

backend_app/requirements.macos.txt

@@ -35,7 +35,7 @@ idna==2.8
 importlib-metadata==1.4.0
 inflection==0.3.1
 itypes==1.1.0
-Jinja2==2.11.3
+Jinja2==3.1.5
 jmespath==0.10.0
 kombu==4.6.7
 MarkupSafe==1.1.1