Fix pydantic format

Author: anmarques

src/guidellm/core/request.py

@@ -42,7 +42,7 @@ def number_images(self) -> int:
             return len(self.images)
 
     @property
-    def image_resolution(self) -> List[Tuple[int]]:
+    def image_resolution(self) -> List[Tuple[int, int]]:
         if self.images is None:
             return None
         else:

src/guidellm/utils/images.py

@@ -28,7 +28,7 @@ class ImageDescriptor(Serializable):
 
     @computed_field # type: ignore[misc]
     @property
-    def image_resolution(self) -> Tuple[int]:
+    def image_resolution(self) -> Tuple[int, int]:
         if self.image is None:
             return None
         else: