Apply suggestions from code review

Author: eaidova

optimum/exporters/openvino/model_configs.py

@@ -1158,7 +1158,7 @@ def patch_model_for_export(
     library_name="transformers",
 )
 class Gemma3TextOpenVINOConfig(Gemma2OpenVINOConfig):
-    MIN_TRANSFORMERS_VERSION = version.parse("4.49.0")
+    MIN_TRANSFORMERS_VERSION = version.parse("4.50.0")
 
 
 class DeciDummyPastKeyValuesGenerator(DummyPastKeyValuesGenerator):
@@ -3030,7 +3030,7 @@ def patch_model_for_export(
 
 @register_in_tasks_manager("gemma3", *["image-text-to-text"], library_name="transformers")
 class Gemma3OpenVINOConfig(LlavaOpenVINOConfig):
-    MIN_TRANSFORMERS_VERSION = "4.49.0"
+    MIN_TRANSFORMERS_VERSION = "4.50.0"
 
     def patch_model_for_export(
         self, model: Union["PreTrainedModel", "TFPreTrainedModel"], model_kwargs: Optional[Dict[str, Any]] = None