[Backport 1.5.latest] Pin `macos` runners to `macos-12` (#1016) #2637

Job	Run time
build packages	17s
code-quality	1m 57s
unit test / python 3.7	1m 52s
unit test / python 3.8	1m 19s
unit test / python 3.9	1m 5s
unit test / python 3.10	1m 13s
unit test / python 3.11	1m 12s
verify packages / python 3.7 / ubuntu-latest	32s
verify packages / python 3.8 / ubuntu-latest	29s
verify packages / python 3.9 / ubuntu-latest	34s
verify packages / python 3.10 / ubuntu-latest	36s
verify packages / python 3.11 / ubuntu-latest	30s
verify packages / python 3.7 / macos-12	1m 8s
verify packages / python 3.8 / macos-12	1m 2s
verify packages / python 3.9 / macos-12	55s
verify packages / python 3.10 / macos-12	1m 2s
verify packages / python 3.11 / macos-12	1m 10s
verify packages / python 3.7 / windows-latest	1m 9s
verify packages / python 3.8 / windows-latest	2m 10s
verify packages / python 3.9 / windows-latest	2m 2s
verify packages / python 3.10 / windows-latest	1m 27s
verify packages / python 3.11 / windows-latest	1m 32s
	25m 13s

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