Type signature is overbroad for `Response.get_json`

[dzcode]

The type signature for Response.get_json is currently:

    def get_json(self, force: bool = False, silent: bool = False) -> t.Optional[t.Any]:

However, if silent is False, as is the default, this is overbroad, since it will always return t.Any. This is problematic in calling code, since you'll get a type checking error if you do something like this:

error: Value of type "Optional[Any]" is not indexable  [index]
                data = rv.get_json()["data"]

This can be fixed by using an overload from the typing module when silent is the Literal[False]

Environment:

• Python version: 3.9.6
• Werkzeug version: 2.1.2