fix default

Author: tomasz-tylenda-sonarsource

.github/workflows/PrepareNextIteration.yml

@@ -6,8 +6,12 @@ on:
       nextVersion:
         description: Version number of the next iteration
         required: true
-        default: 8.0-SNAPSHOT
   push:
+    inputs:
+      nextVersion:
+        description: Version number of the next iteration
+        required: true
+        default: 8.0-SNAPSHOT
     branches:
       - tt/prepare-next-iteration