Fix version tags used in build pipeline

- Should be 4.21 now

Author: fontivan

.tekton/build-pipeline.yaml

@@ -175,7 +175,7 @@ spec:
           value:
             - build-date=$SOURCE_DATE
             - short-commit=$(tasks.clone-repository.results.short-commit)
-            - version=v4.20-$SOURCE_DATE_EPOCH
+            - version=v4.21-$SOURCE_DATE_EPOCH
         - name: source-date-epoch
           value: $(tasks.clone-repository.results.commit-timestamp)
       runAfter:
@@ -259,8 +259,8 @@ spec:
             - description=recert
             - distribution-scope=public
             - io.k8s.description=recert
-            - release=4.20
-            - cpe="cpe:/a:redhat:openshift:4.20::el9"
+            - release=4.21
+            - cpe="cpe:/a:redhat:openshift:4.21::el9"
             - url=https://github.com/rh-ecosystem-edge/recert
             - vendor=Red Hat, Inc.
             - io.k8s.display-name=recert