fix: docs/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CERTIFI-5805047
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-5595532

docs/requirements.txt

@@ -1,4 +1,4 @@
-certifi==2022.12.7
+certifi==2023.7.22
 charset-normalizer==2.1.1
 click==8.1.3
 colorama==0.4.6
@@ -23,7 +23,7 @@ python-dateutil==2.8.2
 PyYAML==6.0.1
 pyyaml_env_tag==0.1
 regex==2023.3.23
-requests==2.28.2
+requests==2.31.0
 six==1.16.0
 termcolor==2.2.0
 urllib3==1.26.15