fix signature of Step::steps_between implementations #3311

Job	Run time
Test MSRV and Stable Features (nightly)	17s
Bootloader Integration Test (ubuntu-latest)	1m 0s
Check Formatting	14s
Bootloader Integration Test (macos-latest)	1m 6s
Test MSRV and Stable Features (1.59)	2m 0s
Clippy	13s
Bootloader Integration Test (windows-latest)	2m 57s
kani	38s
Semver Checks	4m 7s
Test (ubuntu-latest)	30s
Test (macos-12)	40s
Test (macos-latest)	27s
Test (windows-latest)	49s
	14m 58s

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