Update guardian.yml (#38909)

Author: weshaggard

eng/pipelines/guardian.yml

@@ -22,8 +22,5 @@ extends:
         name: $(WINDOWSPOOL)
         image: $(WINDOWSVMIMAGE)
         os: windows
-      credscan:
-        enabled: true
-        # This uses the Credscan Supression file from .config/CredScanSuppressions.json which is the default location for Credscan Suppression Files
       policheck:
         enabled: true