Revert memory test threshold to 13MB

Revert MAX_GROWTH_BYTES from 10MB back to 13MB in test_resource_leaks.py
as tests are still using elevated memory and the reduction cannot be
implemented currently.

The weakref removal changes remain as they are still valid.

Author: adev-code

tests/functional/leak/test_resource_leaks.py

@@ -22,10 +22,10 @@ class TestDoesNotLeakMemory(BaseClientDriverTest):
     # a substantial amount of time to the total test run time.
     INJECT_DUMMY_CREDS = True
     # We're making up numbers here, but let's say arbitrarily
-    # that the memory can't increase by more than 10MB.
+    # that the memory can't increase by more than 13MB.
 
     # TODO: Attempt to bring this back to 10MB once Python 3.14 releases
-    MAX_GROWTH_BYTES = 10 * 1024 * 1024
+    MAX_GROWTH_BYTES = 13 * 1024 * 1024
 
     def test_create_single_client_memory_constant(self):
         self.cmd('create_client', 's3')