Update dependency gatsby-legacy-polyfills to ^0.3.0

Author: renovate-bot

app/package.json

@@ -8,7 +8,7 @@
     "gatsby-plugin-google-analytics": "^2.3.15",
     "gatsby-plugin-typescript": "^2.4.20",
     "gatsby-plugin-react-helmet": "^3.3.11",
-    "gatsby-legacy-polyfills": "^0.0.5",
+    "gatsby-legacy-polyfills": "^0.3.0",
     "gatsby-link": "^2.4.14",
     "gatsby-react-router-scroll": "^3.0.13",
     "event-source-polyfill": "^1.0.20",