ci: Test Emacs 30.2 #76

Job	Run time
test (ubuntu-latest, 28.2, false)	34s
test (ubuntu-latest, 26.3, false)	32s
test (ubuntu-latest, 29.4, false)	34s
test (ubuntu-latest, 30.2, false)	34s
test (macos-latest, 28.2, false)	2m 35s
test (macos-latest, 29.4, false)	3m 14s
test (ubuntu-latest, 27.2, false)	34s
test (windows-latest, 27.2, false)	1m 14s
test (windows-latest, 29.4, false)	1m 8s
test (macos-latest, 30.2, false)	3m 48s
test (ubuntu-latest, snapshot, true)	32s
test (windows-latest, 26.3, false)	1m 41s
test (windows-latest, snapshot, true)	54s
test (windows-latest, 30.2, false)	1m 2s
test (windows-latest, 28.2, false)	1m 1s
test (macos-latest, snapshot, true)	3m 18s
	23m 15s

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