CI: Update Ubuntu 18.04 builder image to latest

The builder image is more than 2 years old.

Change-Id: I39c85835ced572c5a2414eb7ad24186fa1e7d136
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
diff --git a/jenkins-config/clouds/openstack/cattle/ubuntu1804-builder-4c-4g.cfg b/jenkins-config/clouds/openstack/cattle/ubuntu1804-builder-4c-4g.cfg
index d331089..17f8906 100644
--- a/jenkins-config/clouds/openstack/cattle/ubuntu1804-builder-4c-4g.cfg
+++ b/jenkins-config/clouds/openstack/cattle/ubuntu1804-builder-4c-4g.cfg
@@ -1,4 +1,4 @@
 LABELS=ubuntu1804-builder-4c-4g
-IMAGE_NAME=ZZCI - Ubuntu 18.04 - builder - x86_64 - 20200317-165726.675
+IMAGE_NAME=ZZCI - Ubuntu 18.04 - builder - x86_64 - 20220920-114402.749
 HARDWARE_ID=v2-highcpu-4
 VOLUME_SIZE=20