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

@@ -1,4 +1,4 @@
-certifi==2024.6.2
+certifi==2024.2.2
 charset-normalizer==2.1.1
 click==8.1.7
 colorama==0.4.6
@@ -13,7 +13,7 @@ mike==2.1.1
 mkdocs==1.6.0
 mkdocs-exclude==1.0.2
 mkdocs-macros-plugin==1.0.5
-mkdocs-material==9.5.25
+mkdocs-material==9.5.21
 mkdocs-material-extensions==1.3.1
 packaging==24.0
 Pygments==2.18.0
@@ -22,10 +22,10 @@ pyparsing==3.1.2
 python-dateutil==2.9.0.post0
 PyYAML==6.0.1
 pyyaml_env_tag==0.1
-regex==2024.5.15
-requests==2.32.3
+regex==2024.5.10
+requests==2.32.0
 six==1.16.0
 termcolor==2.4.0
 urllib3==1.26.18
 verspec==0.1.0
-watchdog==4.0.1
+watchdog==4.0.0