fix: pg query in mysql dialect (#1051)

Author: faviansamatha

aws_advanced_python_wrapper/database_dialect.py

@@ -177,7 +177,7 @@ def default_port(self) -> int:
 
     @property
     def host_alias_query(self) -> str:
-        return "SELECT pg_catalog.CONCAT(@@hostname, ':', @@port)"
+        return "SELECT CONCAT(@@hostname, ':', @@port)"
 
     @property
     def server_version_query(self) -> str: