fix: Infrastructure/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6514866

Infrastructure/requirements.txt

@@ -28,4 +28,4 @@ fakeredis
 mock
 redis
 
-pillow>=10.2.0 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability