Upgrade art fixtures to babel 7 (#16235)

* chore: upgrade art fixtures to babel 7

* upgrade

* use yarn

fixtures/art/package.json

@@ -1,10 +1,10 @@
 {
   "devDependencies": {
-    "babel-core": "^6.24.0",
-    "babel-loader": "^6.4.1",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-preset-es2015": "^6.6.0",
-    "babel-preset-react": "^6.5.0",
+    "@babel/core": "^7.10.5",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/preset-env": "^7.10.4",
+    "@babel/preset-react": "^7.10.4",
+    "babel-loader": "^8.1.0",
     "react": "link:../../build/node_modules/react",
     "react-art": "link:../../build/node_modules/react-art/",
     "react-dom": "link:../../build/node_modules/react-dom",

fixtures/art/webpack.config.js

@@ -1,5 +1,4 @@
 var webpack = require('webpack');
-var path = require('path');
 
 module.exports = {
   context: __dirname,
@@ -12,10 +11,10 @@ module.exports = {
         exclude: /node_modules/,
         query: {
           presets: [
-            require.resolve('babel-preset-es2015'),
-            require.resolve('babel-preset-react'),
+            require.resolve('@babel/preset-env'),
+            require.resolve('@babel/preset-react'),
           ],
-          plugins: [require.resolve('babel-plugin-transform-class-properties')],
+          plugins: [require.resolve('@babel/plugin-proposal-class-properties')],
         },
       },
     ],