Deploy object_references storage in staging and prod PostgreSQL backends

Now that swh.storage implements sharded storage for object references in PostgreSQL, we should deploy that database schema as well as the housekeeping cronjobs to maintain the partitions.

• fix debian package build for 1.14 on buster.....
• staging: upgrade swh.storage to >= 1.13 (so, 1.14) on storage1
• staging: run the schema upgrade to v188
• production: upgrade swh.storage to 1.14 on saam
• production: run the schema upgrade to v188
• puppet: write housekeeping cron entry for the main storage backends to create future object_references partitions
• staging: deploy cron entry
• production: deploy cron entry