Update GitHub Actions versions (#954) #924

Job	Run time
build (3.8, 5.0.2)	20s
build (3.8, 5.1.1)	24s
build (3.8, 5.2.3)	15s
build (3.8, 5.3.0)	17s
build (3.8, 6.1.3)	23s
build (3.8, git+https://github.com/sphinx-doc/sphinx.git@master)	13s
build (3.9, 5.0.2)	18s
build (3.9, 5.1.1)	19s
build (3.9, 5.2.3)	19s
build (3.9, 5.3.0)	17s
build (3.9, 6.1.3)	17s
build (3.9, git+https://github.com/sphinx-doc/sphinx.git@master)	14s
build (3.10, 5.0.2)	18s
build (3.10, 5.1.1)	18s
build (3.10, 5.2.3)	14s
build (3.10, 5.3.0)	19s
build (3.10, 6.1.3)	15s
build (3.10, git+https://github.com/sphinx-doc/sphinx.git@master)	25s
build (3.11, 5.0.2)	14s
build (3.11, 5.1.1)	14s
build (3.11, 5.2.3)	14s
build (3.11, 5.3.0)	16s
build (3.11, 6.1.3)	16s
build (3.11, git+https://github.com/sphinx-doc/sphinx.git@master)	17s
build (3.12, 5.0.2)	19s
build (3.12, 5.1.1)	18s
build (3.12, 5.2.3)	14s
build (3.12, 5.3.0)	21s
build (3.12, 6.1.3)	19s
build (3.12, git+https://github.com/sphinx-doc/sphinx.git@master)	20s
	8m 47s

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