Fix hassfest type hints for ConfigSubentryFlow (#143502)

pylint/plugins/hass_enforce_type_hints.py

@@ -597,6 +597,16 @@ _CLASS_MATCH: dict[str, list[ClassTypeHintMatch]] = {
                 ),
             ],
         ),
+        ClassTypeHintMatch(
+            base_class="ConfigSubentryFlow",
+            matches=[
+                TypeHintMatch(
+                    function_name="async_step_*",
+                    arg_types={},
+                    return_type="SubentryFlowResult",
+                ),
+            ],
+        ),
     ],
 }
 # Overriding properties and functions are normally checked by mypy, and will only