fix: samples/Pip Requirements/filenames/requirements.txt to reduce vu…

…lnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-2331901

samples/Pip Requirements/filenames/requirements.txt

@@ -17,3 +17,4 @@ kornia==0.6
 invisible-watermark>=0.1.5
 streamlit-drawable-canvas==0.8.0
 -e .
+pillow>=9.0.0 # not directly required, pinned by Snyk to avoid a vulnerability