with the release of rust 1.67, let's bump to 1.66.1 (#7866)

# Description

This PR bumps the required rust version to 1.66.1.

# User-Facing Changes


# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/system/which_.rs

@@ -266,7 +266,13 @@ fn which(
     let paths = env::path_str(engine_state, stack, call.head)?;
 
     for app in which_args.applications {
-        let values = which_single(app, which_args.all, engine_state, &cwd, &paths);
+        let values = which_single(
+            app,
+            which_args.all,
+            engine_state,
+            cwd.clone(),
+            paths.clone(),
+        );
         output.extend(values);
     }