Update snapshots.

tests/snapshots/output/changes_grid_header.snapshot.txt

@@ -13,7 +13,7 @@ _ │ fn main() {
 ~ │         "The perimeter of the rectangle is {} pixels.",
 ~ │         perimeter(&rect1)
   │     );
-+ │     println!(r#"This line contains invalid utf8:  "�����"#;
++ │     println!(r#"This line contains invalid utf8:  "øˆ€€€"#;
   │ }
   │ 
   │ fn area(rectangle: &Rectangle) -> u32 {