gitlab-ci: use rhel10 builder image

ubi10 has been released.

JIRA: INTERNAL
Upstream Status: RHEL only

Part of https://gitlab.com/cki-project/infrastructure/-/issues/463

Signed-off-by: Michael Hofmann <mhofmann@redhat.com>

Author: mh21

.gitlab-ci.yml

@@ -26,7 +26,7 @@ workflow: !reference [.workflow]
     branch: rhel10
   variables:
     kcidb_tree_name: rhel-10
-    builder_image: quay.io/cki/builder-stream10  # no builder-rhel10 without ubi10
+    builder_image: quay.io/cki/builder-rhel10
 
 .trigger_internal_compat_build_pipeline:
   extends: [.trigger_internal_pipeline, .centos_stream_rhel_internal]