GHA: Update CI to use `os: macos-latest` #19

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Run time

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Job	Run time
notify	22s
ci (ubuntu-latest, 5.10)	4m 3s
ci (ubuntu-latest, 5.14)	3m 52s
ci (ubuntu-latest, 5.20)	4m 2s
ci (5.30, ubuntu-latest, true, true)	5m 7s
ci (5.30, macos-latest)	10m 20s
build-status	21s
	28m 7s