fix: packages/homepage/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8187303
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-8229906

packages/homepage/package.json

@@ -41,7 +41,7 @@
     "cannon": "^0.6.2",
     "date-fns": "1.30.1",
     "framer-motion": "^1.6.14",
-    "gatsby": "^2.13.45",
+    "gatsby": "^3.13.0",
     "gatsby-cli": "^2.7.21",
     "gatsby-image": "^2.2.30",
     "gatsby-plugin-google-fonts": "^1.0.1",