Rust 1.85 (#25272)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>

crates/sum_tree/src/tree_map.rs

@@ -26,7 +26,7 @@ impl<K> Default for MapKey<K> {
 #[derive(Clone, Debug)]
 pub struct MapKeyRef<'a, K>(Option<&'a K>);
 
-impl<'a, K> Default for MapKeyRef<'a, K> {
+impl<K> Default for MapKeyRef<'_, K> {
     fn default() -> Self {
         Self(None)
     }