Call to finalize fails on Windows

[mdpiper]

See, for example, tests/test_irf::test_finalize when run in GitHub Actions.

The summary from pytest:

FAILED tests/test_irf.py::test_finalize - PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\runneradmin\\.gridmet\\daily_maximum_temperature_2019-03-15_2019-03-21.nc'

The full stack trace:

________________________________ test_finalize ________________________________
Traceback (most recent call last):
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\runner.py", line 341, in from_call
    result: TResult | None = func()
                             ~~~~^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\runner.py", line 242, in <lambda>
    lambda: runtest_hook(item=item, **kwds), when=when, reraise=reraise
            ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_hooks.py", line 513, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 139, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\threadexception.py", line 92, in pytest_runtest_call
    yield from thread_exception_runtest_hook()
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\threadexception.py", line 68, in thread_exception_runtest_hook
    yield
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\unraisableexception.py", line 95, in pytest_runtest_call
    yield from unraisable_exception_runtest_hook()
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\unraisableexception.py", line 70, in unraisable_exception_runtest_hook
    yield
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\logging.py", line 846, in pytest_runtest_call
    yield from self._runtest_for(item, "call")
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\logging.py", line 829, in _runtest_for
    yield
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\capture.py", line 880, in pytest_runtest_call
    return (yield)
            ^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 122, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
    ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\skipping.py", line 257, in pytest_runtest_call
    return (yield)
            ^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 103, in _multicall
    res = hook_impl.function(*args)
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\runner.py", line 174, in pytest_runtest_call
    item.runtest()
    ~~~~~~~~~~~~^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\python.py", line 1627, in runtest
    self.ihook.pytest_pyfunc_call(pyfuncitem=self)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_hooks.py", line 513, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 139, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\pluggy\_callers.py", line 103, in _multicall
    res = hook_impl.function(*args)
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\site-packages\_pytest\python.py", line 159, in pytest_pyfunc_call
    result = testfunction(**testargs)
  File "D:\a\gridmet_bmi\gridmet_bmi\tests\test_irf.py", line 89, in test_finalize
    model.finalize()
    ~~~~~~~~~~~~~~^^
  File "D:\a\gridmet_bmi\gridmet_bmi\gridmet_bmi\bmi_gridmet.py", line 44, in finalize
    self._model.clear_cache()
    ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "D:\a\gridmet_bmi\gridmet_bmi\gridmet_bmi\gridmet.py", line 77, in clear_cache
    fname.unlink()
    ~~~~~~~~~~~~^^
  File "C:\Users\runneradmin\miniconda3\envs\gridmet_bmi\Lib\pathlib\_local.py", line 746, in unlink
    os.unlink(self)
    ~~~~~~~~~^^^^^^
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\runneradmin\\.gridmet\\daily_maximum_temperature_2019-03-15_2019-03-21.nc'