Update pytest_collect_file hook to remove deprecated path argument

[henry0312]

Replaced the deprecated path argument with file_path: pathlib.Path in the pytest_collect_file hook to address PytestRemovedIn9Warning.

tests/test_pytest_pycodestyle.py: 10 warnings
  /home/runner/work/pytest-pycodestyle/pytest-pycodestyle/src/pytest_pycodestyle.py:22: PytestRemovedIn9Warning: The (path: py.path.local) argument is deprecated, please use (file_path: pathlib.Path)
  see https://docs.pytest.org/en/latest/deprecations.html#py-path-local-arguments-for-hooks-replaced-with-pathlib-path
    def pytest_collect_file(file_path: pathlib.Path, path, parent):

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html