Fix GEPAFeedbackMetric Protocol missing 'self' parameter (#9111)

* Initial plan

* Add missing 'self' parameter to GEPAFeedbackMetric and PredictorFeedbackFn Protocol __call__ methods

Co-authored-by: TomeHirata <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: TomeHirata <[email protected]>

Author: Copilot

dspy/teleprompt/gepa/gepa.py

@@ -25,6 +25,7 @@
 @experimental(version="3.0.0")
 class GEPAFeedbackMetric(Protocol):
     def __call__(
+        self,
         gold: Example,
         pred: Prediction,
         trace: Optional["DSPyTrace"],

dspy/teleprompt/gepa/gepa_utils.py

@@ -42,6 +42,7 @@ class ScoreWithFeedback(Prediction):
 
 class PredictorFeedbackFn(Protocol):
     def __call__(
+        self,
         predictor_output: dict[str, Any],
         predictor_inputs: dict[str, Any],
         module_inputs: Example,