chore: pin JSON serializer dependency for local saves

Packages/manifest.json

@@ -2,6 +2,8 @@
   "dependencies": {
     "com.unity.ide.visualstudio": "2.0.26",
     "com.unity.inputsystem": "1.20.0",
+    "com.unity.nuget.newtonsoft-json": "3.2.2",
+    "com.unity.pipeline": "0.8.0-exp.1",
     "com.unity.render-pipelines.universal": "17.6.0",
     "com.unity.test-framework": "1.8.0",
     "com.unity.ugui": "2.6.0",
@@ -40,7 +42,6 @@
     "com.unity.modules.vehicles": "1.0.0",
     "com.unity.modules.video": "1.0.0",
     "com.unity.modules.wind": "1.0.0",
-    "com.unity.modules.xr": "1.0.0",
-    "com.unity.pipeline": "0.8.0-exp.1"
+    "com.unity.modules.xr": "1.0.0"
   }
 }