Update to yarn berry

.gitignore

@@ -1,6 +1,7 @@
 # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 .idea
 .log*
+.yarn
 
 # dependencies
 /node_modules

package.json

@@ -46,5 +46,6 @@
   },
   "ct3aMetadata": {
     "initVersion": "7.2.0"
-  }
+  },
+  "packageManager": "yarn@4.2.2"
 }