ci: fix miri temporarily #1163

Job	Run time
build (stable) / rust	12s
build (msrv) / rust	20s
build (nightly) / rust	20s
build no_std (stable) / rust	12s
style (stable) / rust	17s
build no_std (stable) [w/o builder] / rust	16s
build no_std (stable) [Windows] / rust	1m 51s
build no_std (msrv) / rust	23s
style (msrv) / rust	21s
build no_std (nightly) / rust	20s
tests with miri (nightly) / rust	1m 24s
style (nightly) / rust	22s
	6m 18s

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