Improve filename normalization for special characters

Cargo.lock

@@ -1321,6 +1321,7 @@ dependencies = [
  "toml",
  "tracing",
  "tracing-subscriber",
+ "unicode-normalization",
  "url",
  "walkdir",
 ]
@@ -1695,6 +1696,15 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9312f7c4f6ff9069b165498234ce8be658059c6728633667c526e27dc2cf1df5"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fd4f6878c9cb28d874b009da9e8d183b5abc80117c40bbd187a1fde336be6e8"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"