ci: refresh docs build dependencies

Author: ansible-documentation-bot[bot]

tests/requirements.txt

@@ -26,7 +26,7 @@ antsibull-changelog==0.34.0
     # via antsibull-docs
 antsibull-core==3.4.0
     # via antsibull-docs
-antsibull-docs==2.20.0
+antsibull-docs==2.21.0
     # via
     #   -c tests/constraints.in
     #   -r tests/requirements.in
@@ -52,11 +52,11 @@ babel==2.17.0
     #   sphinx-intl
 build==1.3.0
     # via antsibull-core
-certifi==2025.7.14
+certifi==2025.8.3
     # via requests
 cffi==1.17.1 ; platform_python_implementation != 'PyPy'
     # via cryptography
-charset-normalizer==3.4.2
+charset-normalizer==3.4.3
     # via requests
 click==8.2.1
     # via sphinx-intl
@@ -65,7 +65,7 @@ colorama==0.4.6 ; os_name == 'nt' or sys_platform == 'win32'
     #   build
     #   click
     #   sphinx
-cryptography==45.0.5
+cryptography==45.0.6
     # via -r tests/requirements.in
 docutils==0.18.1
     # via