Update tektoncd-pruner-1-21-controller to ff76a92

Image created from 'https://github.com/openshift-pipelines/tektoncd-pruner.git?rev=76df772dd0c68cb5c9272421244e05a0948cb9c8'

Signed-off-by: red-hat-konflux-kflux-prd-rh02 <190377777+red-hat-konflux-kflux-prd-rh02[bot]@users.noreply.github.com>

Author: red-hat-konflux-kflux-prd-rh02[bot]

project.yaml

@@ -113,4 +113,4 @@ images:
     value: quay.io/redhat-user-workloads/tekton-ecosystem-tenant/1-21/opc-rhel9@sha256:348d01aa1b1e092baf164c820d295088162bb3518f07f4d740a21607236e5fda
   # Pruner
   - name: IMAGE_PRUNER_CONTROLLER
-    value: quay.io/redhat-user-workloads/tekton-ecosystem-tenant/1-21/pruner-controller-rhel9@sha256:37860a7bc1dce38706602771122812f71d867a154dda78a08ac39c1ed7b968f1
+    value: quay.io/redhat-user-workloads/tekton-ecosystem-tenant/1-21/pruner-controller-rhel9@sha256:ff76a92988c119550a1a8e694dcb4166280ebe274bf1e6a7fc58ff3f17ce26f3