chore: fix last clippy lints and enforce in CI #2863

Job	Run time
rustfmt-clippy	4s
docs	25s
minimal	17s
check-cfg	19s
msrv	48s
quickchecking	19s
test-book	12s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 43s
test-expectations (ubuntu-latest)	43s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 41s
test-expectations (macos-latest)	58s
test-no-headers	27s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 41s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 44s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 10s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 9s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 14s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 15s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 2s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 9s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 57s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	3m 58s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 59s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 54s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 52s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 47s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 34s
test (macos-latest, 16.0, 0, 0, 0)	1m 59s
success	1s
	1h 0m 21s

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