chore: Remove the `deny-warnings` feature #171

Job	Run time
Determine toolchains	4s
cargo clippy (ubuntu-24.04, nightly)	3m 2s
cargo clippy (macos-15, nightly)	2m 48s
cargo clippy (ubuntu-24.04, 1.90.0)	3m 54s
cargo clippy (macos-15, 1.90.0)	3m 59s
cargo clippy (macos-15, stable)	2m 35s
cargo clippy (ubuntu-24.04, stable)	3m 10s
cargo clippy (windows-2025, 1.90.0)	7m 8s
cargo clippy (windows-2025, stable)	6m 32s
cargo clippy (windows-2025, nightly)	6m 51s
	40m 3s

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