PYTHON-5784 Alpha sort test_periodic_executor.py in synchro list

Author: aclark4life

tools/synchro.py

@@ -252,6 +252,7 @@ def async_only_test(f: str) -> bool:
     "test_monitoring.py",
     "test_mongos_load_balancing.py",
     "test_on_demand_csfle.py",
+    "test_periodic_executor.py",
     "test_pooling.py",
     "test_raw_bson.py",
     "test_read_concern.py",
@@ -279,7 +280,6 @@ def async_only_test(f: str) -> bool:
     "unified_format.py",
     "utils_selection_tests.py",
     "utils.py",
-    "test_periodic_executor.py",
 ]