ci: use conformance repo's composite GitHub Action #253

Job	Run time
checks / pre-commit	39s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, windows-latest)	2m 39s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 39s
checks / test (3.10, lowest-direct, windows-latest)	2m 38s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, windows-latest)	3m 33s
checks / test (3.14, locked, windows-latest)	2m 59s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.11, locked, windows-latest)	2m 55s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.13, locked, windows-latest)	2m 24s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, windows-latest)	3m 25s
checks / test (3.10, locked, windows-latest)	2m 24s
all-green	2s
	38m 42s

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