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/bindings/buffer_source.rs

@@ -887,7 +887,7 @@ impl DataBlock {
                 *cx,
                 range.end - range.start,
                 // SAFETY: This is safe because we have checked there is no overlapping view
-                (*raw)[range.clone()].as_mut_ptr() as _,
+                (&mut (*raw))[range.clone()].as_mut_ptr() as _,
                 Some(free_func),
                 raw as _,
             )