ci: use conformance repo's composite GitHub Action #254

Job	Run time
checks / readme-snippets	14s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 34s
checks / test (3.13, locked, windows-latest)	2m 26s
checks / test (3.12, locked, windows-latest)	3m 35s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, windows-latest)	2m 50s
checks / pre-commit	32s
checks / test (3.10, locked, windows-latest)	2m 29s
checks / test (3.11, lowest-direct, windows-latest)	2m 49s
checks / test (3.11, locked, windows-latest)	2m 31s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, windows-latest)	3m 32s
checks / test (3.12, lowest-direct, windows-latest)	3m 39s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.14, locked, windows-latest)	3m 20s
all-green	3s
	40m 20s

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