ci: Try to fix macOS runners by running on macos-12. #2119

Job	Run time	Billable time
minimal	9s	0s
docs	16s	0s
msrv	2m 27s	0s
rustfmt-clippy	30s	0s
check-cfg	20s	0s
quickchecking	13s	0s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 47s	0s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 2s	0s
test-book	6s	0s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 53s	0s
test-expectations (ubuntu-latest)	51s	0s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 59s	0s
test-expectations (macos-12)	2m 59s	0s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 15s	0s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 30s	0s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 21s	0s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 12s	0s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	2m 40s	0s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	2m 29s	0s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	2m 35s	0s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	2m 31s	0s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	3m 10s	0s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	3m 4s	0s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	2m 58s	0s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	2m 56s	0s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 45s	0s
test (macos-12, 9.0, 0, 0, 0)	1m 50s	0s
success	1s	0s
	50m 49s	0s

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