[code-infra] Align next dependency specifier across project (#44036)

Author: Janpot

packages/mui-material-nextjs/package.json

@@ -43,7 +43,7 @@
     "@emotion/react": "^11.13.3",
     "@emotion/server": "^11.11.0",
     "@types/react": "^18.3.6",
-    "next": "14.2.14",
+    "next": "^14.2.14",
     "react": "^18.3.1"
   },
   "peerDependencies": {