Fix `checked_conversions` lint #2826

Job	Run time
msrv	50s
minimal	10s
check-cfg	21s
docs	20s
quickchecking	16s
test-book	13s
rustfmt-clippy	30s
test-expectations (ubuntu-latest)	37s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 40s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 39s
test-expectations (macos-latest)	40s
test-no-headers	24s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	2m 8s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 34s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 3s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 6s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 5s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 6s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 8s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	3m 52s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 36s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	3m 56s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 50s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 51s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	5m 11s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 42s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 31s
test (macos-latest, 16.0, 0, 0, 0)	1m 57s
success	1s
	59m 17s

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