ci: Test Emacs 30.1 #285

Job	Run time
test (ubuntu-latest, 26.3)	36s
test (ubuntu-latest, 27.2)	44s
test (ubuntu-latest, 28.2)	42s
test (ubuntu-latest, 29.4)	2m 15s
test (ubuntu-latest, 30.1)	1m 31s
test (macos-latest, 28.2)	3m 13s
test (macos-latest, 29.4)	5m 27s
test (macos-latest, 30.1)	4m 58s
test (windows-latest, 26.3)	26m 1s
test (windows-latest, 27.2)	8m 10s
test (windows-latest, 28.2)	2m 57s
test (windows-latest, 29.4)	3m 24s
test (windows-latest, 30.1)	19m 8s
test (ubuntu-latest, snapshot, true)	39s
test (macos-latest, snapshot, true)	4m 10s
test (windows-latest, snapshot, true)	19m 46s
	1h 43m 41s

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