fix: docs/requirements.txt to reduce vulnerabilities

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

Author: snyk-bot

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