chore: bump vsn for helm chart

deploy/charts/emqx/Chart.yaml

@@ -14,8 +14,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 5.0.7
+version: 5.0.8
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 5.0.7
+appVersion: 5.0.8