remove macos-12 #1000 #1218

Job	Run time
skip_check	6s
get_version	3s
lint (3.8)	22s
lint (3.9)	20s
type_check (3.8)	27s
lint (3.10)	19s
type_check (3.9)	29s
lint (3.11)	20s
type_check (3.10)	24s
lint (3.12)	23s
type_check (3.11)	25s
type_check (3.12)	29s
patch_version / patch_version	3s
extract_changelog / extract_changelog	7s
test_non_linux (3.12, macos-13)	54s
test_non_linux (3.12, macos-14)	43s
test_non_linux (3.12, windows-2019)	1m 7s
test (3.8)	42s
test_non_linux (3.12, windows-2022)	1m 19s
test (3.9)	44s
test (3.10)	43s
test (3.11)	46s
test (3.12)	1m 1s
	12m 16s

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