chore(package.json): bump version from 1.2.0 to 1.2.1 for release preparation

package.json

@@ -1,6 +1,6 @@
 {
   "name": "workoutcool",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "private": true,
   "scripts": {
     "dev": "next dev --turbopack",