[deps] Update fontique dep `memmap2` to 0.9.4 #22

Job	Run time
cargo check (msrv) (windows-latest)	1m 23s
cargo clippy (android) (armv7-linux-androideabi)	46s
cargo check (msrv) (macos-14)	46s
cargo clippy (windows-latest)	1m 47s
cargo clippy (android) (aarch64-linux-android)	46s
cargo check (msrv) (android) (armv7-linux-androideabi)	41s
cargo check (msrv) (ubuntu-latest)	43s
cargo clippy (macos-14)	53s
cargo clippy (android) (x86_64-linux-android)	48s
cargo check (msrv) (android) (aarch64-linux-android)	41s
cargo clippy (ubuntu-latest)	56s
cargo check (msrv) (android) (x86_64-linux-android)	42s
cargo doc (windows-latest)	1m 19s
cargo fmt	19s
cargo doc (macos-14)	45s
cargo test (windows-latest)	1m 22s
cargo doc (ubuntu-latest)	27s
cargo test (macos-14)	39s
cargo test (ubuntu-latest)	34s
	16m 17s

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