Update prettier to v2 (#11579)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

packages/babel-plugin-transform-react-jsx/src/transform-classic.js

@@ -92,7 +92,7 @@ export default declare((api, options) => {
     },
   };
 
-  visitor.JSXAttribute = function(path) {
+  visitor.JSXAttribute = function (path) {
     if (t.isJSXElement(path.node.value)) {
       path.node.value = t.jsxExpressionContainer(path.node.value);
     }