bump version to 12.1.1

Author: seanyu4296

composer.json

@@ -2,7 +2,7 @@
   "name": "xendit/m2invoice",
   "description": "Xendit Payment Gateway Module",
   "type": "magento2-module",
-  "version": "12.1.0",
+  "version": "12.1.1",
   "license": [
     "GPL-3.0"
   ],