Azure/GitLab: Update to latest Docker image

This provides a newer ARC toolchain along with being based on a newer
Ubuntu bionic tag.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 08bdf81..55bde3d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@
 
 # Grab our configured image.  The source for this is found at:
 # https://gitlab.denx.de/u-boot/gitlab-ci-runner
-image: trini/u-boot-gitlab-ci-runner:bionic-20200311-10Apr2020
+image: trini/u-boot-gitlab-ci-runner:bionic-20200403-27Apr2020
 
 # We run some tests in different order, to catch some failures quicker.
 stages: