Version.njk: Update the Mu DevOps version to v18.0.3 (#527)

Updates Mu repos to use the latest Mu DevOps release.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

Author: makubacki

.sync/Version.njk

@@ -30,7 +30,7 @@
 #}
 
 {# The git ref value that files dependent on this repo will use. #}
-{% set mu_devops = "v18.0.2" %}
+{% set mu_devops = "v18.0.3" %}
 
 {# The latest Project Mu release branch value. #}
 {% set latest_mu_release_branch = "release/202511" %}