Use `macos-latest` on CI #2638

Job	Run time
docs	31s
minimal	16s
msrv	49s
check-cfg	22s
quickchecking	23s
rustfmt-clippy	26s
test-book	6s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 38s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 38s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 36s
test-expectations (ubuntu-latest)	44s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 38s
test-expectations (macos-latest)	55s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	1m 37s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	1m 37s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	1m 37s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	1m 37s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	1m 37s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	1m 40s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	1m 37s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	1m 38s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 40s
test (macos-latest, 9.0, 0, 0, 0)	1m 22s
success	1s
	33m 37s

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