NO-JIRA Fix test-private values to reflect proper version numbers (#77276)

* Fix periodic-prow-auto-owners PR base branch from master to main (#74759)

The job was failing with a 422 error when trying to create PRs against
openshift/release#master because that branch no longer exists after
being renamed to main.

Updates --pr-base-branch argument to match the extra_refs base_ref.

* updating files to match proper revision values

---------

Co-authored-by: Jakub Guzik <jguzik@redhat.com>

Author: dhensel-rh

ci-operator/config/openshift/release/openshift-release-main__nightly-4.23.yaml

@@ -82,7 +82,7 @@ base_images:
   tests-private:
     name: tests-private
     namespace: ci
-    tag: "4.21"
+    tag: "4.23"
   upi-installer:
     name: "4.23"
     namespace: ocp

ci-operator/config/openshift/release/openshift-release-main__nightly-5.0.yaml

@@ -82,7 +82,7 @@ base_images:
   tests-private:
     name: tests-private
     namespace: ci
-    tag: "4.21"
+    tag: "5.0"
   upi-installer:
     name: "5.0"
     namespace: ocp