macOS: raise deployment target #207

Job	Run time
Type checks (3.9)	2m 50s
Build SDist	9s
Code Format	6s
Type checks (3.10)	1m 12s
Build Wheels (ubuntu-latest, x86_64)	21m 37s
Type checks (3.11)	53s
Build Wheels (macos-12, x86_64)	11m 39s
Type checks (3.12)	1m 0s
Linting	10s
Build Wheels (macos-12, arm64)	9m 34s
Runs tests (3.9)	2m 19s
Build Wheels (windows-2019, x86)	9m 14s
Publish Test Results Event File	3s
Runs tests (3.10)	3m 4s
Build Wheels (windows-2019, AMD64)	13m 7s
Runs tests (3.11)	2m 3s
Runs tests (3.12)	2m 34s
Deploy wheels to PyPI	0s
	1h 21m 34s

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