message: Update supported CONV_2D version from 1 to 2.
  The GPU delegate already supports dilated conv.
diff: @@ -843,7 +843,7 @@ class Conv2DOperationParser : public TFLiteOperationParser {
  Status IsSupported(const TfLiteContext* context,
  const TfLiteNode* tflite_node,
  const TfLiteRegistration* registration) final {
  - RETURN_IF_ERROR(CheckMaxSupportedOpVersion(registration, 1));
  + RETURN_IF_ERROR(CheckMaxSupportedOpVersion(registration, 2));
  RETURN_IF_ERROR(
  CheckInputsOutputs(context, tflite_node, /*inputs=*/1, /*outputs=*/1));
  RETURN_IF_ERROR(CheckTensorIsAvailable(context, tflite_node, 1));
  