Update dependabot.yml #1128

Job	Run time
build (msrv) / rust	17s
build (stable) / rust	18s
build (nightly) / rust	26s
style (msrv) / rust	17s
build no_std (msrv) / rust	16s
build no_std (stable) / rust	14s
style (stable) / rust	14s
build no_std (stable) [Windows] / rust	17s
build no_std (stable) [w/o builder] / rust	14s
build no_std (nightly) / rust	11s
style (nightly) / rust	10s
tests with miri (nightly) / rust	11s
	3m 5s

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