serializer_kwargs are missing in load_payload function

[alexeykomp]

When using this library with a serializer, it's sometimes necessary to provide the serializer with additional kwargs. It works great within the dump_payload function. However, load_payload function doesn't supply any stored serializer_kwargs into the serializer. I'm not sure if it's done intentionally or just forgotten.

Here's the code to reproduce the problem:

import jsonpickle
from itsdangerous import Serializer

key = '123'
data = {0: 'foo', 1: "bar"}
s = Serializer(key, serializer=jsonpickle, serializer_kwargs={"keys": True})

signed = s.dumps(data)
unsigned = s.loads(signed)
print(unsigned)  
# {'json://0': 'foo', 'json://1': 'bar'} - because the kwarg "keys": True was not overhanded to the loading function

The expected behavior would be to provide load_payload with **serializer_kwargs and return {0: 'foo', 1: 'bar'} in this example.

I personally opted to have separate Serializer instances for dumping and loading processes, but may it be smarter to implement a separate "deserializer_kwargs" parameter?
I see the problem that serializer_kwargs may require to be different for serializing and deserializing - that's why my suggested solution (straight-forward overhanding of serializer_kwargs into deserializer function) doesn't pass the existing tests.

Environment:

• Python version: 3.12
• ItsDangerous version: 2.2.0