ci: Test Emacs 30.1 #606

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 7s
test (ubuntu-latest, 28.2, false)	1m 12s
test (ubuntu-latest, 29.4, false)	4m 16s
test (ubuntu-latest, 30.1, false)	5m 2s
test (macos-latest, 28.2, false)	2m 24s
test (macos-latest, 29.4, false)	4m 44s
test (macos-latest, 30.1, false)	4m 10s
test (windows-latest, 27.2, false)	3m 16s
test (windows-latest, 28.2, false)	3m 0s
test (windows-latest, 29.4, false)	23m 27s
test (windows-latest, 30.1, false)	20m 17s
test (ubuntu-latest, snapshot, true)	53s
test (macos-latest, snapshot, true)	1m 59s
test (windows-latest, snapshot, true)	20m 46s
	1h 36m 33s

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