fix new rust warnings #7913

Job	Run time
build (ubuntu-latest, nightly)	7m 16s
build-linux-musl (nightly)	8m 17s
build (ubuntu-latest, stable)	7m 17s
build-linux-musl (stable)	8m 39s
build (ubuntu-latest, 1.70)	7m 8s
build-linux-musl (1.70)	8m 15s
build (macos-latest, nightly)	6m 7s
build (macos-latest, stable)	6m 56s
build (macos-latest, 1.70)	5m 54s
build-apple-x86 (nightly)	5m 1s
build-linux-arm (nightly)	16m 10s
build (windows-latest, nightly)	27m 7s
build-apple-x86 (stable)	1m 32s
build-linux-arm (stable)	16m 12s
build (windows-latest, stable)	25m 11s
build-apple-x86 (1.70)	5m 38s
build-linux-arm (1.70)	16m 51s
build (windows-latest, 1.70)	26m 36s
Lints	3m 15s
Changelog Test	7s
udeps	7m 37s
	3h 37m 6s

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