Revert incorrect version bump from automatic merge

Author: fedgiac

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cowprotocol/contracts",
-  "version": "2.1.0-alpha",
+  "version": "2.0.0-alpha",
   "license": "LGPL-3.0-or-later",
   "private": true,
   "repository": {