Fix `nightly` compiler warnings #5575

Job	Run time
Test (Address Sanitizer)	4m 8s
Test (ubuntu-latest)	2m 10s
Check mininum supported Rust version	26s
Build	2m 5s
Test (macos-latest)	1m 46s
Test (windows-latest)	3m 54s
uDeps	6m 21s
Clippy	1m 35s
Fuzz (differential)	3m 52s
Documentation	42s
Fuzz (execute)	3m 46s
Formatting	23s
Fuzz (translate)	3m 47s
Miri	9m 11s
Coverage	5m 5s
Audit	2m 48s
Miri (spec)	6m 13s
	58m 12s

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