ci: Test Emacs 30.1 #85

Job	Run time
build (ubuntu-latest, 26.3, false)	54s
build (ubuntu-latest, 27.2, false)	1m 6s
build (ubuntu-latest, 28.2, false)	3m 5s
build (ubuntu-latest, 29.4, false)	1m 19s
build (ubuntu-latest, 30.1, false)	1m 15s
build (macos-latest, 26.3, false)	1m 23s
build (macos-latest, 27.2, false)	1m 36s
build (macos-latest, 28.2, false)	1m 23s
build (macos-latest, 29.4, false)	1m 22s
build (macos-latest, 30.1, false)	1m 16s
build (windows-latest, 26.3, false)	14m 26s
build (windows-latest, 27.2, false)	4m 32s
build (windows-latest, 28.2, false)	5m 8s
build (windows-latest, 29.4, false)	11m 15s
build (windows-latest, 30.1, false)	2m 39s
build (ubuntu-latest, snapshot, true)	51s
build (macos-latest, snapshot, true)	1m 34s
build (windows-latest, snapshot, true)	3m 26s
	58m 30s

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