bpo-45401: Fix a resource warning in test_logging (GH-28864)

Author: serhiy-storchaka

Lib/test/test_logging.py

@@ -5324,6 +5324,7 @@ def test_should_not_rollover(self):
         time.sleep(1.1)    # a little over a second ...
         r = logging.makeLogRecord({'msg': 'testing - device file'})
         self.assertFalse(fh.shouldRollover(r))
+        fh.close()
 
     # other test methods added below
     def test_rollover(self):