[SOGo] Update to 5.0.0.20200816-1

helper-scripts/docker-compose.override.yml.d/BUILD_FLAGS/docker-compose.override.yml

@@ -17,7 +17,7 @@ services:
       context: ./data/Dockerfiles/sogo
       dockerfile: Dockerfile
       args:
-        - SOGO_DEBIAN_REPOSITORY=http://packages.inverse.ca/SOGo/nightly/4/debian/
+        - SOGO_DEBIAN_REPOSITORY=http://packages.inverse.ca/SOGo/nightly/5/debian/
 
   dovecot-mailcow:
     build: ./data/Dockerfiles/dovecot