[fontique] fontconfig: allow_dtd for xml config #27

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	50s
cargo check (msrv) (android) (armv7-linux-androideabi)	43s
cargo clippy (android) (aarch64-linux-android)	48s
cargo check (msrv) (windows-latest)	1m 28s
cargo check (msrv) (android) (aarch64-linux-android)	47s
cargo clippy (android) (x86_64-linux-android)	49s
cargo check (msrv) (macos-14)	45s
cargo clippy (windows-latest)	2m 0s
cargo check (msrv) (android) (x86_64-linux-android)	46s
cargo clippy (macos-14)	1m 10s
cargo check (msrv) (ubuntu-latest)	41s
cargo clippy (ubuntu-latest)	51s
cargo doc (windows-latest)	1m 56s
cargo fmt	22s
cargo doc (macos-14)	41s
cargo doc (ubuntu-latest)	31s
cargo test (windows-latest)	1m 31s
cargo test (macos-14)	50s
cargo test (ubuntu-latest)	36s
	18m 5s

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