message: test: fix `override` example
  Since we're pretty printing we get double quotes, not single quotes.
diff: @@ -260,7 +260,7 @@ const nodeMajorVersion = parseInt(process.versions.node, 10);
  check([
  "class Dog extends Animal {",
  " protected override getSound() {",
  - " return 'bark';",
  + " return \"bark\";",
  " }",
  "}",
  ])
  