updating v1 url for consistency

Author: Andrewq11

polaris/hub/client.py

@@ -784,9 +784,9 @@ def _upload_benchmark(
             benchmark_json["access"] = access
 
             path_params = (
-                "v1/benchmark" if artifact_type == ArtifactSubtype.STANDARD.value else "v2/competition"
+                "/v1/benchmark" if artifact_type == ArtifactSubtype.STANDARD.value else "/v2/competition"
             )
-            url = f"/{path_params}/{benchmark.owner}/{benchmark.name}"
+            url = f"{path_params}/{benchmark.owner}/{benchmark.name}"
             response = self._base_request_to_hub(url=url, method="PUT", json=benchmark_json)
 
             progress_indicator.update_success_msg(