counters: Update to statsd compliant docker image

Refs. swh/infra/sysadm-environment#5376

apps/swh-counters/entrypoint.sh

@@ -23,6 +23,8 @@ case "$1" in
             --threads ${THREADS} \
             --workers ${WORKERS} \
             --timeout ${TIMEOUT} \
+            --statsd-host=${STATSD_HOST}:${STATSD_PORT} \
+            --statsd-prefix=${STATSD_SERVICE_TYPE} \
             --reload \
             --config 'python:swh.core.api.gunicorn_config' \
             'swh.counters.api.server:make_app_from_configfile()'