build(deps): bump actions/checkout from 5 to 6 (#284) #1248

Job	Run time
build (msrv) / rust	25s
build (stable) / rust	19s
build (nightly) / rust	22s
build no_std (stable) [w/o builder] / rust	14s
build no_std (stable) / rust	17s
build no_std (stable) [Windows] / rust	59s
style (stable) / rust	15s
style (nightly) / rust	23s
build no_std (nightly) / rust	25s
tests with miri (nightly) / rust	1m 23s
build no_std (msrv) / rust	22s
style (msrv) / rust	27s
	5m 51s

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