fix: MyPy findings due to a mypy version upgrade were corrected (#1477)

Author: erikwrede

graphene/types/inputobjecttype.py

@@ -14,7 +14,7 @@ class InputObjectTypeOptions(BaseOptions):
     container = None  # type: InputObjectTypeContainer
 
 
-class InputObjectTypeContainer(dict, BaseType):
+class InputObjectTypeContainer(dict, BaseType):  # type: ignore
     class Meta:
         abstract = True
 

graphene/validation/depth_limit.py

@@ -53,7 +53,7 @@
 def depth_limit_validator(
     max_depth: int,
     ignore: Optional[List[IgnoreType]] = None,
-    callback: Callable[[Dict[str, int]], None] = None,
+    callback: Optional[Callable[[Dict[str, int]], None]] = None,
 ):
     class DepthLimitValidator(ValidationRule):
         def __init__(self, validation_context: ValidationContext):