Update dependency @storybook/builder-webpack5 to v6.3.0-beta.8

Author: renovate-bot

packages/app/package-lock.json

@@ -21,7 +21,7 @@
     "@storybook/addon-essentials": "6.2.9",
     "@storybook/addon-links": "6.2.9",
     "@storybook/addon-storysource": "6.2.9",
-    "@storybook/builder-webpack5": "6.3.0-beta.7",
+    "@storybook/builder-webpack5": "6.3.0-beta.8",
     "@storybook/react": "6.2.9",
     "@types/enzyme": "3.10.8",
     "@types/jest": "26.0.23",