Elide lifetimes where possible after rustup (#34824)

The new version of rust allows us to elide some lifetimes and clippy is
now complaining about this. This change elides them where possible and
removes the clippy exceptions.

Fixes #34804.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/script/stylesheet_set.rs

@@ -18,7 +18,7 @@ where
     Document(&'a mut DocumentStylesheetSet<S>),
 }
 
-impl<'a, S> StylesheetSetRef<'a, S>
+impl<S> StylesheetSetRef<'_, S>
 where
     S: StylesheetInDocument + PartialEq + 'static,
 {