.sync/Version.njk: Update Mu repos to Mu DevOps v2.5.1 (#170)

Changes since last release:
v2.4.0...v2.5.1

General release info: https://github.com/microsoft/mu_devops/releases

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 = "v2.4.0" %}
+{% set mu_devops = "v2.5.1" %}
 
 {# The latest Project Mu release branch value. #}
 {% set latest_mu_release_branch = "release/202208" %}