fix: requirements.txt to reduce vulnerabilities (#36)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-7267250

Co-authored-by: snyk-bot <[email protected]>

Author: ndrezn

requirements.txt

@@ -8,4 +8,5 @@ beautifulsoup4==4.9.3
 unidecode==1.1.1
 cairosvg==2.5.2
 moviepy==1.0.3
-numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability