Bump minimum supported Emacs version #100

Job	Run time
test (ubuntu-latest, 27.2)	3m 34s
test (ubuntu-latest, 28.2)	3m 43s
test (ubuntu-latest, 29.3)	4m 1s
test (ubuntu-latest, snapshot)	3m 57s
test (macos-latest, 27.2)	48s
test (macos-latest, 28.2)	2m 28s
test (macos-latest, 29.3)	2m 51s
test (macos-latest, snapshot)	2m 29s
test (windows-latest, 27.2)	4m 27s
test (windows-latest, 28.2)	4m 8s
test (windows-latest, 29.3)	5m 23s
test (windows-latest, snapshot)	5m 51s
	43m 40s

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