Revert "chore: Bump Rust to 1.89 (#35788)" (#35843)

This reverts commit efba2cbfd3.

Unfortunately, the Docker image for 1.89 has not shown up yet. Once it
has, we should re-land this.

Release Notes:

- N/A

crates/terminal_view/src/terminal_element.rs

@@ -136,7 +136,7 @@ impl BatchedTextRun {
             .shape_line(
                 self.text.clone().into(),
                 self.font_size.to_pixels(window.rem_size()),
-                std::slice::from_ref(&self.style),
+                &[self.style.clone()],
                 Some(dimensions.cell_width),
             )
             .paint(pos, dimensions.line_height, window, cx);