remove duplicated file names in synchro

Author: sleepyStick

tools/synchro.py

@@ -214,14 +214,13 @@ def async_only_test(f: str) -> bool:
     "test_dns.py",
     "test_encryption.py",
     "test_examples.py",
-    "test_heartbeat_monitoring.py",
-    "test_index_management.py",
     "test_grid_file.py",
     "test_gridfs.py",
-    "test_load_balancer.py",
-    "test_json_util_integration.py",
     "test_gridfs_spec.py",
+    "test_heartbeat_monitoring.py",
+    "test_index_management.py",
     "test_json_util_integration.py",
+    "test_load_balancer.py",
     "test_logger.py",
     "test_max_staleness.py",
     "test_monitoring.py",