Fix `clippy::manual_ignore_case_cmp` lint (#285) #1006

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	50s
cargo clippy (android) (aarch64-linux-android)	1m 47s
cargo clippy (windows-latest)	2m 19s
cargo check (msrv) (android) (armv7-linux-androideabi)	40s
cargo clippy (android) (x86_64-linux-android)	1m 34s
cargo check (msrv) (android) (aarch64-linux-android)	26s
cargo check (msrv) (windows-latest)	1m 30s
cargo clippy (macos-latest)	52s
cargo check (msrv) (macos-latest)	44s
cargo check (msrv) (android) (x86_64-linux-android)	44s
cargo clippy (ubuntu-latest)	59s
cargo check (msrv) (ubuntu-latest)	25s
cargo doc (windows-latest)	2m 55s
cargo doc (macos-latest)	55s
formatting	29s
Prime LFS Cache	4s
cargo doc (ubuntu-latest)	1m 18s
typos	4s
cargo test (windows-latest)	1m 46s
cargo test (macos-latest)	38s
cargo test (ubuntu-latest)	26s
	21m 25s

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