CI: Update Ubuntu 18.04 image

This image is built with the latest version of golang
1.17.

Issue-ID: IT-22913
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
Change-Id: Id3109a732eae65d1a015d908d8c44303e7a1644f
diff --git a/jenkins-config/clouds/openstack/cattle/ubuntu1804-docker-4c-4g.cfg b/jenkins-config/clouds/openstack/cattle/ubuntu1804-docker-4c-4g.cfg
index 9bc64fb..7af0cf1 100644
--- a/jenkins-config/clouds/openstack/cattle/ubuntu1804-docker-4c-4g.cfg
+++ b/jenkins-config/clouds/openstack/cattle/ubuntu1804-docker-4c-4g.cfg
@@ -1,4 +1,4 @@
 LABELS=ubuntu1804-docker-4c-4g
-IMAGE_NAME=ZZCI - Ubuntu 18.04 - docker - x86_64 - 20210907-210908.190
+IMAGE_NAME=ZZCI - Ubuntu 18.04 - docker - x86_64 - 20210920-102432.804
 HARDWARE_ID=v2-highcpu-4
 VOLUME_SIZE=20