Fix indentation in DummyConnection class

Removed extra whitespace in the DummyConnection class in test_connection_pool.py
to maintain consistent indentation throughout the file. This helps maintain
code style consistency across the codebase.

Author: ngabhanenetskope

tests/test_connection_pool.py

@@ -29,7 +29,7 @@ def __init__(self, **kwargs):
 
     def connect(self):
         pass
-    
+
     def can_read(self):
         return False