Clean up event triggers in scorecard workflow

Removed unused event triggers for branch protection and maintained checks.

Signed-off-by: James Pether Sörling <pethers@users.noreply.github.com>

Author: pethers

.github/workflows/scorecard.yml

@@ -4,11 +4,6 @@
 
 name: Scorecard supply-chain security
 on:
-  # For Branch-Protection check. Only the default branch is supported. See
-  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
-  branch_protection_rule:
-  # To guarantee Maintained check is occasionally updated. See
-  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
   schedule:
     - cron: '37 2 * * 4'
   push: