update base image registry

Author: Ashok Guntupalli

.tekton/managed-cluster-validating-webhooks-pull-request.yaml

@@ -34,7 +34,6 @@ spec:
   - name: build-args
     value: 
       - BASE_IMAGE=brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_9_1.24
-
   pipelineSpec:
     description: |
       This pipeline is ideal for building container images from a Containerfile while maintaining trust after pipeline customization.