proxy: Fix some warnings by extended clippy checks (#8748)

* Missing blank lifetimes which is now deprecated.
* Matching off unqualified enum variants that could act like variable.
* Missing semicolons.

proxy/src/url.rs

@@ -12,7 +12,7 @@ impl ApiUrl {
     }
 
     /// See [`url::Url::path_segments_mut`].
-    pub fn path_segments_mut(&mut self) -> url::PathSegmentsMut {
+    pub fn path_segments_mut(&mut self) -> url::PathSegmentsMut<'_> {
         // We've already verified that it works during construction.
         self.0.path_segments_mut().expect("bad API url")
     }