fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - gatsby from 5.8.0-next.3 to 5.13.7.
    See this package in npm: https://www.npmjs.com/package/gatsby
  - react from 18.2.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react
  - react-dom from 18.2.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react-dom
  - dotenv from 16.0.0 to 16.4.5.
    See this package in npm: https://www.npmjs.com/package/dotenv

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/dca2e9c3-af28-4092-95db-059fac7d1940?utm_source=github&utm_medium=referral&page=upgrade-pr

apps/playgrounds/gatsby/package.json

@@ -10,11 +10,11 @@
     "clean": "gatsby clean"
   },
   "dependencies": {
-    "dotenv": "16.0.0",
-    "gatsby": "5.8.0-next.3",
+    "dotenv": "16.4.5",
+    "gatsby": "5.13.7",
     "next-auth": "workspace:*",
-    "react": "18.2.0",
-    "react-dom": "18.2.0"
+    "react": "18.3.1",
+    "react-dom": "18.3.1"
   },
   "devDependencies": {
     "vercel": "23.1.2"