added Hash to MouseScrollUnit; #56644

Job	Run time
miri	11m 35s
build (windows-latest)	11m 9s
check-doc	10m 14s
check-bevy-internal-imports	4s
check-missing-examples-in-docs	30s
build (ubuntu-latest)	5m 43s
ci	2m 39s
run-examples-macos-metal	5m 43s
build (macos-latest)	4m 21s
toml	1m 53s
typos	5s
check-missing-features-in-docs	27s
markdownlint	1m 3s
check-compiles	5m 5s
check-compiles-no-std	1m 19s
build-wasm-atomics	1m 33s
build-wasm	49s
msrv	53s
	1h 5m 5s

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