Trigger macos package build only on 'published' event (#497)

Currently macos package will trigger on 'released' event, which also
includes draft releases.
Change to 'published' to be in sync with all other action triggers

.github/workflows/pkg_macos.yaml

@@ -17,7 +17,7 @@ on:
         default: false
         type: boolean
   release:
-    types: [released]
+    types: [published]
 
 jobs:
   pkg: