Pydantic v2 is not supported

Describe the bug Probably, current version of uplink is not supporting pydantic v2

To Reproduce

from uplink import Body, Consumer, post
from pydantic import BaseModel, AnyHttpUrl  # v2.0.3

class A(BaseModel):
    url: AnyHttpUrl

class C(Consumer):
    @post('http://localhost')
    def test(self, a: Body(type=A)):
        ...

a = A(url='http://localhost')
C().test(a=a)

gives

Traceback (most recent call last):
  File "/home/djbios/.config/JetBrains/PyCharm2022.2/scratches/scratch_31.py", line 16, in <module>
    C().test(a=a)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/builder.py", line 100, in __call__
    self._request_definition.define_request(request_builder, args, kwargs)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/commands.py", line 284, in define_request
    self._argument_handler.handle_call(
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/arguments.py", line 154, in handle_call
    self.handle_call_args(request_builder, call_args)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/arguments.py", line 159, in handle_call_args
    annotation.modify_request(request_builder, call_args[name])
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/arguments.py", line 183, in modify_request
    converted_value = converter(value) if converter else value
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/interfaces.py", line 6, in __call__
    return self.convert(*args, **kwargs)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/pydantic_.py", line 34, in convert
    return _encode_pydantic(value)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/pydantic_.py", line 25, in _encode_pydantic
    return _encode_pydantic(pydantic_encoder(obj))
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/pydantic_.py", line 20, in _encode_pydantic
    return {_encode_pydantic(k): _encode_pydantic(v) for k, v in obj.items()}
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/pydantic_.py", line 20, in <dictcomp>
    return {_encode_pydantic(k): _encode_pydantic(v) for k, v in obj.items()}
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/uplink/converters/pydantic_.py", line 25, in _encode_pydantic
    return _encode_pydantic(pydantic_encoder(obj))
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/typing_extensions.py", line 2562, in wrapper
    return __arg(*args, **kwargs)
  File "/home/djbios/.pyenv/versions/3.10.8/lib/python3.10/site-packages/pydantic/deprecated/json.py", line 103, in pydantic_encoder
    raise TypeError(f"Object of type '{obj.__class__.__name__}' is not JSON serializable")
TypeError: Object of type 'Url' is not JSON serializable

Expected behavior Url is pydantic type and should be serialized to str. The issue caused by calling deprecated pydantic_encoder

Additional context Not sure if there are other cases of new pydantic not supported, but probably uplink should require pydantic<2

prkumar / uplink

Pydantic v2 is not supported #297