refactor: remove obsolete `#[allow(private_interfaces)]` #109

Job	Run time
semver	15s
format	8s
clippy (1.64.0, --no-default-features)	2m 38s
clippy-benches	27s
clippy (stable, --no-default-features)	12s
test	2m 28s
clippy (nightly, --all-features, --tests)	28s
	6m 36s

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