Update zenith to 0.15.1 (#869)

Co-authored-by: JohnGarbutt <[email protected]>

Author: azimuth-automation-bot[bot]

roles/zenith/defaults/main.yml

@@ -3,7 +3,7 @@
 # The chart to use
 zenith_chart_repo: https://azimuth-cloud.github.io/zenith
 zenith_chart_name: zenith-server
-zenith_chart_version: 0.15.0
+zenith_chart_version: 0.15.1
 
 # Release information for the Zenith release
 # Use the same namespace as the Azimuth release by default