fix: docs/requirements.txt to reduce vulnerabilities (#242)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390193
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390194

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: replit-reliability

docs/requirements.txt

@@ -118,7 +118,7 @@ sphinxcontrib-serializinghtml==2.0.0
     # via sphinx
 typing-extensions==4.12.2
     # via -r requirements.in
-urllib3==2.3.0
+urllib3==2.5.0
     # via
     #   -r requirements.in
     #   requests