cargo: Bump rustc to 1.89 (#36818)

Update Rustc to 1.89.

Reviewable by commit.

Leftover work:
- #37330 
- #38777

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
Co-authored-by: sagudev <16504129+sagudev@users.noreply.github.com>

components/script/dom/idbdatabase.rs

@@ -226,7 +226,7 @@ impl IDBDatabaseMethods<crate::DomTypeHolder> for IDBDatabase {
         if auto_increment {
             match key_path {
                 Some(StringOrStringSequence::String(path)) => {
-                    if path == "" {
+                    if path.is_empty() {
                         return Err(Error::InvalidAccess);
                     }
                 },