Re-enable `unexpected_cfgs` #29

Job	Run time
check (1.60.0, windows-latest)	1m 49s
check (1.60.0, ubuntu-latest)	1m 35s
check (stable, windows-latest)	1m 10s
check (stable, ubuntu-latest)	26s
check (nightly, windows-latest)	32s
check (nightly, ubuntu-latest)	17s
	5m 49s

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