ci: don't run the suite on schedule

the suite is failing due to jakarta pr changes - not known if intended

Author: berezovskyi

.github/workflows/maven-core-cm.yml

@@ -8,8 +8,9 @@ on:
     branches: [master, main]
   pull_request:
     branches: [master, main]
-  schedule:
-    - cron: "30 4 * * 5" # catch SNAPSHOT breaking changes
+  # schedule:
+  #   - cron: "30 4 * * 5" # catch SNAPSHOT breaking changes
+  workflow_dispatch:
 
 jobs:
   build: