fix: Panic on long numerical file names

Closes: #258

[lexical_sort](https://github.com/Aloso/lexical-sort) is currently
unmaintained. The author recommends switching to the `icu` crate which
is maintained by the Unicode Consortium.

Cargo.toml

@@ -21,7 +21,8 @@ ignore = "0.4"
 image = "0.24"
 once_cell = "1.19"
 open = "5.0.2"
-lexical-sort = "0.3.1"
+icu = { version = "1.5", features = [ "sync" ] }
+icu_provider = "1.5"
 libc = "0.2"
 log = "0.4"
 mime_guess = "2"