deps: update to latest VPE for new IMaterialConverter

Author: jsm174

package.json

@@ -7,11 +7,11 @@
     "Unity",
     "URP"
   ],
-  "unity": "2020.2",
-  "unityRelease": "0b12",
+  "unity": "2021.2",
+  "unityRelease": "7f1",
   "dependencies": {
-    "com.unity.render-pipelines.universal": "10.2.1",
-    "org.visualpinball.engine.unity": "0.0.1-preview.83"
+    "com.unity.render-pipelines.universal": "12.1.2",
+    "org.visualpinball.engine.unity": "0.0.1-preview.85"
   },
   "author": "freezy <[email protected]>",
   "contributors": [