Update zenith to 0.7.3 (#516)

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

roles/zenith/defaults/main.yml

@@ -3,7 +3,7 @@
 # The chart to use
 zenith_chart_repo: https://stackhpc.github.io/zenith
 zenith_chart_name: zenith-server
-zenith_chart_version: 0.7.2
+zenith_chart_version: 0.7.3
 
 # Release information for the Zenith release
 # Use the same namespace as the Azimuth release by default