fix: docs/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-SOCKETIO-7278048

Author: snyk-bot

docs/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "author": "Hunter Chang",
   "dependencies": {
-    "gatsby": "^3.0.0",
+    "gatsby": "^5.12.0",
     "gatsby-plugin-google-analytics": "^2.1.16",
     "gatsby-plugin-manifest": "^3.13.0",
     "gatsby-plugin-offline": "^2.0.25",