fix(components): Fix copy button copies outdated snippet

https://github.com/storybookjs/storybook/issues/18829

Fixed a regression introduced in 5f5cf81060afb6124b1f2382accbe2b2e7a47003.

`highlightableCode` was missing in dependencies array therefore
the copied code snippet was fixed to the first-rendered one.

code/lib/components/src/syntaxhighlighter/syntaxhighlighter.tsx

@@ -177,7 +177,7 @@ export const SyntaxHighlighter: FC<SyntaxHighlighterProps> = ({
         })
         .catch(logger.error);
     },
-    []
+    [highlightableCode]
   );
 
   return (