Fix clippy errors after Rust update #5982

Job	Run time
build test linux x86-64	6m 28s
scarb-metadata compatibility check	44s
check-website	9s
build test windows x86-64	13m 23s
check-rust	3m 57s
doc tests	3m 5s
test linux x86-64 1/8	6m 8s
test linux x86-64 2/8	8m 41s
test linux x86-64 3/8	8m 6s
test linux x86-64 4/8	5m 51s
test linux x86-64 5/8	5m 49s
test linux x86-64 6/8	4m 12s
test linux x86-64 7/8	4m 41s
test linux x86-64 8/8	2m 48s
test windows x86-64 1/8	5m 54s
test windows x86-64 2/8	9m 6s
test windows x86-64 3/8	8m 13s
test windows x86-64 4/8	6m 6s
test windows x86-64 5/8	5m 52s
test windows x86-64 6/8	4m 41s
test windows x86-64 7/8	4m 35s
test windows x86-64 8/8	4m 0s
	2h 2m 29s

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