Update Dockerfile

Author: cbaker6

Dockerfile

@@ -18,7 +18,6 @@ RUN apt-get update \
       postgresql-$PG_MAJOR-repack \
       postgresql-$PG_MAJOR-cron \
       postgresql-$PG_MAJOR-pgrouting \
-      postgresql-$PG_MAJOR-pg-cron \
  && rm -rf /var/lib/apt/lists/* \
  && mkdir -p /docker-entrypoint-initdb.d