revert accidental package.json

Author: Niranjan Jayakar

packages/@aws-cdk/aws-efs/package.json

@@ -104,6 +104,7 @@
   "engines": {
     "node": ">= 10.12.0"
   },
+  "stability": "experimental",
   "maturity": "experimental",
   "awscdkio": {
     "announce": false