fix new rust warnings #7912

Job	Run time
build-apple-x86 (nightly)	4m 56s
build-linux-arm (nightly)	16m 12s
build (ubuntu-latest, nightly)	7m 9s
build-linux-arm (stable)	17m 1s
build-linux-musl (nightly)	8m 19s
build (ubuntu-latest, stable)	7m 10s
build-linux-arm (1.70)	16m 17s
build-linux-musl (stable)	8m 21s
build-apple-x86 (stable)	1m 32s
build (ubuntu-latest, 1.70)	7m 15s
build-linux-musl (1.70)	8m 10s
build-apple-x86 (1.70)	4m 44s
build (macos-latest, nightly)	6m 16s
Lints	3m 18s
build (macos-latest, stable)	6m 23s
Changelog Test	6s
build (macos-latest, 1.70)	5m 50s
udeps	7m 7s
build (windows-latest, nightly)	26m 34s
build (windows-latest, stable)	25m 52s
build (windows-latest, 1.70)	26m 26s
	3h 34m 58s

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