fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6182918

Author: snyk-bot

requirements.txt

@@ -8,4 +8,5 @@ Shapely
 
 # Packaging
 setuptools>=40.6.3
-wheel>=0.32.3
+wheel>=0.32.3
+pillow>=10.2.0 # not directly required, pinned by Snyk to avoid a vulnerability