Update dependency @storybook/react to v6

Author: renovate-bot

package.json

@@ -61,7 +61,7 @@
     "@babel/traverse": "7.11.5",
     "@hot-loader/react-dom": "16.13.0",
     "@percy/storybook": "3.3.1",
-    "@storybook/react": "5.3.21",
+    "@storybook/react": "6.0.21",
     "autoprefixer": "9.8.6",
     "babel-eslint": "10.1.0",
     "babel-jest": "26.3.0",