ci: re-schedule trigger pre-release (#124)

this schedule is incorrect according to the table and colliding with nri-memcached

Author: gsanchezgavier

.github/workflows/trigger_prerelease.yml

@@ -7,7 +7,7 @@ name: Trigger prerelease creation
 on:
   workflow_dispatch:
   schedule:
-    - cron: "30 7 * * 1"
+    - cron: "30 7 * * 2"
 
 jobs:
   prerelease: