sync docs requirements with rtfd (#168)

Author: mmckerns

docs/requirements.txt

@@ -1,53 +1,54 @@
 # Packages required to build docs
 # dependencies pinned as:
-# https://github.com/readthedocs/readthedocs.org/blob/73d63d35cd2a9951609fdff1c30dd287ccb57065/requirements/docs.txt
+# https://github.com/readthedocs/readthedocs.org/blob/018c5f8c97cd130de9182f09fbad62c188d09dad/requirements/docs.txt
 
 alabaster==1.0.0
-anyio==4.12.0
-babel==2.17.0
-certifi==2025.11.12
-charset-normalizer==3.4.4
-click==8.3.1
+anyio==4.13.0
+babel==2.18.0
+certifi==2026.4.22
+charset-normalizer==3.4.7
+click==8.3.3
 colorama==0.4.6
 docutils==0.21.2
 h11==0.16.0
 idna==3.15
-imagesize==1.4.1
+imagesize==2.0.0
 jinja2==3.1.6
-markdown-it-py==3.0.0
+markdown-it-py==4.0.0
 markupsafe==3.0.3
 mdit-py-plugins==0.5.0
 mdurl==0.1.2
-myst-parser==4.0.1
-packaging==25.0
+myst-parser==5.0.0
+packaging==26.2
 pygments==2.20.0
 pyyaml==6.0.3
-requests==2.33.0
-roman-numerals-py==3.1.0
+requests==2.33.1
+roman-numerals==4.1.0
+roman-numerals-py==4.1.0
 six==1.17.0
 snowballstemmer==3.0.1
 sphinx==8.2.3
 sphinx-autobuild==2025.8.25
 sphinx-copybutton==0.5.2
-sphinx-design==0.6.1
+sphinx-design==0.7.0
 sphinx-intl==2.3.2
 sphinx-multiproject==1.0.0
 sphinx-notfound-page==1.1.0
 sphinx-prompt==1.10.2
-sphinx-rtd-theme==3.0.2
-sphinx-tabs==3.4.7
+sphinx-rtd-theme==3.1.0
+sphinx-tabs==3.5.0
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0
 sphinxcontrib-htmlhelp==2.1.0
-sphinxcontrib-httpdomain==1.8.1
+sphinxcontrib-httpdomain==2.0.0
 sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
 sphinxext-opengraph==0.13.0
-starlette==0.50.0
+starlette==1.0.1
 typing-extensions==4.15.0
 urllib3==2.7.0
-uvicorn==0.38.0
+uvicorn==0.46.0
 watchfiles==1.1.1
-websockets==15.0.1
+websockets==16.0