Turn off label-has-for in strict rule set

`label-has-for` has been deprecated and is already turned off in the recommended rule set.
Context: https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/master/docs/rules/label-has-for.md

Author: janmonschke

src/index.js

@@ -265,7 +265,7 @@ module.exports = {
             ],
           },
         ],
-        'jsx-a11y/label-has-for': 'error',
+        'jsx-a11y/label-has-for': 'off',
         'jsx-a11y/label-has-associated-control': 'error',
         'jsx-a11y/media-has-caption': 'error',
         'jsx-a11y/mouse-events-have-key-events': 'error',