chore(deps): update quay.io/konflux-ci/tekton-catalog/task-buildah:0.6 docker digest to a6fbfc5

Author: renovate[bot]

pipelines/default-build.yaml

@@ -224,7 +224,7 @@ spec:
           - name: name
             value: buildah
           - name: bundle
-            value: quay.io/konflux-ci/tekton-catalog/task-buildah:0.6@sha256:e8648dff9859d89a0dbaedd120eec2e07afbffc850e706d16d0ac479a905efa0
+            value: quay.io/konflux-ci/tekton-catalog/task-buildah:0.6@sha256:a6fbfc569c3ebeee9ab032e06a456a1aa8c2d45476a49d03e8bcacb71bd03aac
           - name: kind
             value: task
         resolver: bundles