bpo-45401: Fix a resource warning in test_logging (GH-28864) (GH-28872)

(cherry picked from commit 15188b115a2da815556053372c912a81a74be43b)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 1a5f8b6..93f6e5f 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -5298,6 +5298,7 @@ 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):