upgrade bracoxide to v0.1.4 (fixes #14290) (#14296)

I'm  sorry I'm not following the PR template but this is a quick fix.

Fixes #14290

crates/nu-command/src/strings/str_/expand.rs

@@ -307,6 +307,20 @@ fn str_expand(contents: &str, span: Span, value_span: Span) -> Value {
 mod tests {
     use super::*;
 
+    #[test]
+    fn test_outer_single_item() {
+        assert_eq!(
+            str_expand("{W{x,y}}", Span::test_data(), Span::test_data()),
+            Value::list(
+                vec![
+                    Value::string(String::from("Wx"), Span::test_data(),),
+                    Value::string(String::from("Wy"), Span::test_data(),)
+                ],
+                Span::test_data(),
+            )
+        );
+    }
+
     #[test]
     fn dots() {
         assert_eq!(