Bump readthedocs build image #2628

Job	Run time
Build source distribution	59s
Build wheel on ubuntu-22.04-arm	2m 38s
Build wheel on ubuntu-latest	2m 51s
Build wheel on macos-15-large	2m 5s
Build wheel on macos-14	1m 41s
Build wheel on windows-latest	4m 43s
test_dist_pypi	7s
upload_nightly	0s
upload_pypi	0s
	15m 4s

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