chore(dev): Pin nextjs version in dev dependencies (#3555)

Author: lobsterkatie

packages/nextjs/package.json

@@ -29,7 +29,7 @@
     "@sentry/types": "6.4.0",
     "@types/webpack": "^5.28.0",
     "eslint": "7.20.0",
-    "next": "^10.1.3",
+    "next": "10.1.3",
     "rimraf": "3.0.2"
   },
   "peerDependencies": {