chore(deps): Update org.visualpinball.engine.unity to 0.0.1-preview.20.

Author: github-actions[bot]

package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "com.unity.render-pipelines.high-definition": "10.2.2",
     "com.unity.render-pipelines.high-definition-config": "10.2.2",
-    "org.visualpinball.engine.unity": "0.0.1-preview.19",
+    "org.visualpinball.engine.unity": "0.0.1-preview.20",
     "org.visualpinball.unity.assetlibrary.hdrp": "0.0.1-preview.12"
   },
   "author": "freezy <[email protected]>",
@@ -34,4 +34,4 @@
   "publishConfig": {
     "registry": "https://registry.visualpinball.org"
   }
-}
+}