Fix Mercure Chart version

Author: dunglas

api/helm/api/requirements.yaml

@@ -4,7 +4,7 @@ dependencies:
   repository: https://kubernetes-charts.storage.googleapis.com/
   condition: postgresql.enabled
 - name: mercure
-  version: ~3.9.0
+  version: ~1.0.0
   repository: https://kubernetes-charts.storage.googleapis.com/
   condition: mercure.enabled
 - name: blackfire