Move 26.4.1 to updated release commit

Release: r25.12.1

Release: r25.10.1-rc1

[ci skip] update changelog for release

[ci skip] readthedocs yaml

update readthedocs.yaml

[ci skip] making sure modern readthedocs can recompile this branch

modernize readthedocs config to get it to build again

[ci skip] making branch for initial mesa release so we can update rea…

…dthedocs config and rebuild docs

Release: r24.06.1-rc1