chore: fix last clippy lints and enforce in CI #2976

Job	Run time
msrv	55s
rustfmt	13s
docs	25s
clippy	29s
minimal	33s
quickchecking	18s
test-expectations (ubuntu-latest)	46s
test-expectations (macos-latest)	51s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	2m 35s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 46s
test-book	6s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 39s
test-no-headers	34s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	2m 15s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 9s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 5s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 7s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 12s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 27s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 8s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 59s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 27s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 55s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	19m 47s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 41s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	5m 48s
test (ubuntu-latest, 16.0, 0, 0, 1)	3m 22s
test (macos-latest, 16.0, 0, 0, 0)	2m 45s
success	1s
	1h 20m 18s

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