Bump which from 6.0.3 to 7.0.0 #8335

Job	Run time
build-linux-musl (nightly)	9m 22s
build-apple-x86 (nightly)	2m 51s
build-linux-arm (nightly)	6m 12s
build-apple-x86 (stable)	2m 5s
build (ubuntu-latest, nightly)	8m 24s
build-linux-musl (stable)	3m 9s
build-linux-arm (stable)	18m 6s
build-apple-x86 (1.70)	5m 28s
build (ubuntu-latest, stable)	2m 17s
build-linux-musl (1.70)	3m 43s
build-linux-arm (1.70)	6m 17s
build (ubuntu-latest, 1.70)	8m 20s
build (macos-latest, nightly)	2m 29s
Lints	3m 19s
Changelog Test	5s
build (macos-latest, stable)	2m 25s
udeps	7m 39s
build (macos-latest, 1.70)	7m 18s
build (windows-latest, nightly)	4m 25s
build (windows-latest, stable)	7m 6s
build (windows-latest, 1.70)	6m 7s
	1h 57m 7s

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