fix: docs/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-6928867

docs/requirements.txt

@@ -4,7 +4,7 @@ jinja2>=3.1.3 # not directly required, pinned by Snyk to avoid a vulnerability
 markupsafe==2.0.1
 pydata-sphinx-theme==0.7.2
 pygments>=2.15.0 # not directly required, pinned by Snyk to avoid a vulnerability
-requests>=2.31.0 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.32.0 # not directly required, pinned by Snyk to avoid a vulnerability
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
 sphinx==4.3.0
 sphinx-autoapi==1.8.4