Bump chart version (PostHog#740)

Author: frankh

charts/posthog/Chart.yaml

@@ -11,7 +11,7 @@ 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: 30.20.0
+version: 30.21.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.