Send process_id when updating worker activity

Closes #71 (closed)

arkindex_worker/worker/__init__.py

@@ -189,6 +189,7 @@ class ElementsWorker(
                 id=self.worker_version_id,
                 body={
                     "element_id": str(element_id),
+                    "process_id": self.process_information["id"],
                     "state": state.value,
                 },
             )