fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BODYPARSER-7926860
- https://snyk.io/vuln/SNYK-JS-EXPRESS-7926867

package.json

@@ -21,7 +21,7 @@
     "dotenv": "^8.2.0",
     "ethereum-blockies-base64": "^1.0.2",
     "framer-motion": "^4.1.3",
-    "gatsby": "^3.0.4",
+    "gatsby": "^4.19.0",
     "gatsby-image": "^3.0.0",
     "gatsby-plugin-intl": "^0.3.3",
     "gatsby-plugin-lodash": "^4.0.0",