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Rollup merge of #158309 - GuillaumeGomez:update-literal-escaper, r=GuillaumeGomez
Update `rustc-literal-escaper` version to `0.0.8`
This new version contains a minor performance improvement. More detail in the PR: https://github.com/rust-lang/literal-escaper/pull/27
cc @hkBst
r? ghost
