clippy_dev: bump rustc-literal-escaper to 0.0.8

We've been running this way at work for a while and forgot to send the
patch upstream.

Author: durin42

clippy_dev/Cargo.toml

@@ -10,7 +10,7 @@ clap = { version = "4.4", features = ["derive"] }
 indoc = "1.0"
 itertools = "0.15"
 opener = "0.8"
-rustc-literal-escaper = "0.0.7"
+rustc-literal-escaper = "0.0.8"
 walkdir = "2.3"
 
 [package.metadata.rust-analyzer]