ci: Test Emacs 30.1 #33

Job	Run time
test (ubuntu-latest, 27.2, false)	39s
test (ubuntu-latest, 28.2, false)	44s
test (ubuntu-latest, 29.4, false)	1m 45s
test (ubuntu-latest, 30.1, false)	1m 52s
test (macos-latest, 28.2, false)	3m 0s
test (macos-latest, 29.4, false)	3m 56s
test (macos-latest, 30.1, false)	3m 58s
test (windows-latest, 27.2, false)	2m 18s
test (windows-latest, 28.2, false)	1m 10s
test (windows-latest, 29.4, false)	6m 14s
test (windows-latest, 30.1, false)	1m 28s
test (ubuntu-latest, snapshot, true)	36s
test (macos-latest, snapshot, true)	2m 24s
test (windows-latest, snapshot, true)	5m 24s
	35m 28s

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