Bump s3 worker to 0.2.0rc3

To get this patch arkindex/workers/import/s3!15 (merged)

Context https://redmine.teklia.com/issues/9806

arkindex/system_workers.yml

@@ -10,7 +10,7 @@ features:
         image: registry.gitlab.teklia.com/arkindex/workers/init-elements:0.1.1
         command: worker-init-elements
     s3_ingest:
-        image: registry.gitlab.teklia.com/arkindex/workers/import/s3:0.2.0-rc2
+        image: registry.gitlab.teklia.com/arkindex/workers/import/s3:0.2.0rc3
     pdf_export:
         teklia_worker:
             name: arkindex/workers/export