Switch to maintained successor of unescape crate #47

Job	Run time
lint	45s
cargo-deny (advisories)	19s
cargo-deny (bans licenses sources)	19s
aarch64-apple-darwin / build	1m 32s
aarch64-apple-ios / build	1m 24s
aarch64-unknown-linux-gnu / build	45s
aarch64-unknown-linux-musl / build	1m 10s
arm-linux-androideabi / build	2m 0s
armv7-linux-androideabi / build	34s
i686-pc-windows-gnu / build	2m 15s
i686-pc-windows-msvc / build	2m 8s
i686-unknown-linux-gnu / build	41s
msrv / build	4m 45s
i686-unknown-linux-musl / build	1m 57s
x86_64-apple-darwin / build	1m 24s
x86_64-pc-windows-gnu / build	3m 44s
x86_64-pc-windows-msvc / build	2m 32s
x86_64-unknown-freebsd / build	38s
x86_64-unknown-linux-gnu / build	1m 10s
x86_64-unknown-linux-musl / build	1m 8s
x86_64-unknown-netbsd / build	25s
	31m 35s

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