Use `macos-latest` on CI #2641

Job	Run time
msrv	1m 2s
docs	25s
quickchecking	20s
check-cfg	21s
minimal	17s
rustfmt-clippy	26s
test-book	5s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 44s
test-expectations (ubuntu-latest)	56s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 49s
test-expectations (macos-latest)	38s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 34s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 37s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	1m 50s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	1m 51s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	1m 49s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	1m 49s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	1m 52s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	1m 51s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	1m 51s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 48s
test (macos-latest, 16.0, 0, 0, 0)	1m 51s
success	1s
	37m 2s

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