fix: Fix all pytest warnings

[dmb225]

Warnings fixed:

======================================================= warnings summary ========================================================
.venv/lib/python3.13/site-packages/_pytest/config/__init__.py:1474
  /Users/dmb/code/nexios/.venv/lib/python3.13/site-packages/_pytest/config/__init__.py:1474: PytestConfigWarning: Unknown config option: asyncio_fixture_scope
  
    self._warn_or_fail_if_strict(f"Unknown config option: {key}\n")

nexios/__init__.py:196: 4 warnings
test/test_auth.py: 8 warnings
test/test_cors.py: 7 warnings
test/test_dependencies.py: 13 warnings
test/test_event.py: 4 warnings
test/test_exception_handlers.py: 10 warnings
test/test_grouping.py: 8 warnings
test/test_middleware.py: 7 warnings
test/test_pagination.py: 6 warnings
test/test_request_objects.py: 14 warnings
test/test_routing.py: 11 warnings
test/test_session.py: 3 warnings
  /Users/dmb/code/nexios/nexios/__init__.py:196: DeprecationWarning: get_application is deprecated. Please use NexiosApp instead.
    warnings.warn(

nexios/testing/client.py:16
  /Users/dmb/code/nexios/nexios/testing/client.py:16: PytestCollectionWarning: cannot collect test class 'Client' because it has a __init__ constructor (from: test/test_templating.py)
    class Client(httpx.AsyncClient):

test/test_websockets.py:86
  /Users/dmb/code/nexios/test/test_websockets.py:86: PytestCollectionWarning: cannot collect test class 'TestConsumer' because it has a __init__ constructor (from: test/test_websockets.py)
    class TestConsumer(WebSocketConsumer):

test/test_middleware.py::TestBaseMiddleware::test_base_middleware_call
  /Users/dmb/code/nexios/.venv/lib/python3.13/site-packages/_pytest/python.py:157: RuntimeWarning: coroutine 'BaseMiddleware.__call__' was never awaited
    result = testfunction(**testargs)
  Enable tracemalloc to get traceback where the object was allocated.
  See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.

test/test_middleware.py::TestCommonMiddleware::test_common_middleware_content_length_limit
  /Users/dmb/code/nexios/.venv/lib/python3.13/site-packages/httpx/_models.py:408: DeprecationWarning: Use 'content=<...>' to upload raw bytes/text content.
    headers, stream = encode_request(

test/test_pydantic_utils.py::TestPydanticErrorHandling::test_valid_request
  /Users/dmb/code/nexios/test/test_pydantic_utils.py:134: PydanticDeprecatedSince20: The `dict` method is deprecated; use `model_dump` instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.11/migration/
    return response.json(user.dict())

test/test_request_objects.py::test_cookies
  /Users/dmb/code/nexios/nexios/testing/client.py:79: DeprecationWarning: Setting per-request cookies=<...> is being deprecated, because the expected behaviour on cookie persistence is ambiguous. Set cookies directly on the client instance instead.
    response = await super().request(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=============================================== 245 passed, 102 warnings in 1.70s ===============================================

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