feat(gatsby): Support Gatsby v5 (#6635)

Author: rjoonas

packages/gatsby/package.json

@@ -27,7 +27,7 @@
     "@sentry/webpack-plugin": "1.19.0"
   },
   "peerDependencies": {
-    "gatsby": "^2.0.0 || ^3.0.0 || ^4.0.0",
+    "gatsby": "^2.0.0 || ^3.0.0 || ^4.0.0 || ^5.0.0",
     "react": "15.x || 16.x || 17.x || 18.x"
   },
   "devDependencies": {