Fix clippy: make MAIN_SEPARATOR import conditional for unix

Author: karthiknadig

crates/pet-fs/src/path.rs

@@ -3,9 +3,12 @@
 
 use std::{
     env,
-    path::{Path, PathBuf, MAIN_SEPARATOR},
+    path::{Path, PathBuf},
 };
 
+#[cfg(unix)]
+use std::path::MAIN_SEPARATOR;
+
 /// Strips trailing path separators from a path, preserving root paths.
 ///
 /// This function removes trailing `/` or `\` from paths while ensuring that root paths