ci: disable conformance tests #516

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, lowest-direct, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, windows-latest)	2m 43s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 8s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, windows-latest)	3m 45s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, lowest-direct, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, windows-latest)	2m 48s
checks / test (3.12, locked, windows-latest)	3m 29s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.11, locked, windows-latest)	2m 29s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
all-green	5s
	39m 28s

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