Update Rust crate unicode-ident to 1.0.12 #339

Job	Run time
Lint	1m 13s
Build and test core crates (ubuntu-latest, 1.66)	3m 25s
Build and test (all features) (ubuntu-latest, 1.66)	5m 7s
Build and test core crates (ubuntu-latest, stable)	2m 47s
Build and test (all features) (ubuntu-latest, stable)	3m 53s
Build and test core crates (macos-latest, 1.66)	5m 41s
Build and test (all features) (macos-latest, 1.66)	6m 54s
Build and test core crates (macos-latest, stable)	4m 32s
Build and test (all features) (macos-latest, stable)	5m 40s
Build and test core crates (windows-latest, 1.66)	6m 22s
Build and test (all features) (windows-latest, 1.66)	10m 11s
Build and test core crates (windows-latest, stable)	9m 3s
Build and test (all features) (windows-latest, stable)	7m 43s
Build documentation (ubuntu-latest)	1m 54s
Cross-compile to aarch64	3m 42s
cargo-compare extended tests (ubuntu-latest)	4m 19s
cargo-compare extended tests (macos-latest)	6m 41s
	1h 29m 7s

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