ci: Test Emacs 30.1 #56

Job	Run time
test (ubuntu-latest, 26.3, false)	42s
test (ubuntu-latest, 27.2, false)	38s
test (ubuntu-latest, 28.2, false)	36s
test (ubuntu-latest, 29.4, false)	53s
test (ubuntu-latest, 30.1, false)	1m 52s
test (macos-latest, 28.2, false)	1m 28s
test (macos-latest, 29.4, false)	2m 21s
test (macos-latest, 30.1, false)	2m 1s
test (windows-latest, 26.3, false)	2m 27s
test (windows-latest, 27.2, false)	3m 43s
test (windows-latest, 28.2, false)	2m 31s
test (windows-latest, 29.4, false)	3m 53s
test (windows-latest, 30.1, false)	5m 18s
test (ubuntu-latest, snapshot, true)	36s
test (macos-latest, snapshot, true)	1m 36s
test (windows-latest, snapshot, true)	4m 5s
	34m 40s

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