bpo-40823: Use loadTestsFromTestCase() iso. makeSuite() in sqlite3 tests (GH-20538)

Author: Erlend Egeberg Aasland

Lib/sqlite3/test/backup.py

@@ -162,7 +162,7 @@ def test_database_source_name(self):
 
 
 def suite():
-    return unittest.makeSuite(BackupTests)
+    return unittest.TestLoader().loadTestsFromTestCase(BackupTests)
 
 if __name__ == "__main__":
     unittest.main()