Updated packages.

Author: neogeek

package.json

@@ -14,7 +14,7 @@
     "com.unity.modules.ui": "1.0.0",
     "com.unity.modules.xr": "1.0.0",
     "com.unity.ugui": "1.0.0",
-    "com.unity.xr.arfoundation": "3.1.0-preview.7"
+    "com.unity.xr.arfoundation": "3.1.0-preview.8"
   },
   "keywords": [
     "components",