[Bug]: ModuleNotFoundError: No module named 'packaging'

[H0R5E]

What happened?

Installing version 0.21.0 from conda-forge results in a ModuleNotFoundError on import (for Python 3.9, at least).

What did you expect to happen?

For xarray to import without crashing.

Minimal Complete Verifiable Example

(base) > conda create -y -n _xarray_bug --override-channels -c conda-forge python=3.9 xarray
...
The following NEW packages will be INSTALLED:
...
  python             conda-forge/win-64::python-3.9.10-hcf16a7b_1_cpython
...
  xarray             conda-forge/noarch::xarray-0.21.0-pyhd8ed1ab_0
...
(base) > conda activate _xarray_bug
(_xarray_bug) > python -c "import xarray"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\__init__.py", line 1, in <module>
    from . import testing, tutorial, ufuncs
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\testing.py", line 8, in <module>
    from xarray.core import duck_array_ops, formatting, utils
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\core\duck_array_ops.py", line 24, in <module>
    from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\core\dask_array_compat.py", line 4, in <module>
    from packaging.version import Version
ModuleNotFoundError: No module named 'packaging'

Relevant log output

No response

Anything else we need to know?

No response

Environment

(_xarray_bug) > python -c "import xarray as xr;xr.show_versions()"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\__init__.py", line 1, in <module>
    from . import testing, tutorial, ufuncs
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\testing.py", line 8, in <module>
    from xarray.core import duck_array_ops, formatting, utils
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\core\duck_array_ops.py", line 24, in <module>
    from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
  File "C:\Anaconda3\envs\_xarray_bug\lib\site-packages\xarray\core\dask_array_compat.py", line 4, in <module>
    from packaging.version import Version
ModuleNotFoundError: No module named 'packaging'

(_xarray_bug) > conda info

     active environment : _xarray_bug
    active env location : C:\Anaconda3\envs\_xarray_bug
            shell level : 2
       user config file : C:\Users\Work\.condarc
 populated config files : C:\Users\Work\.condarc
          conda version : 4.11.0
    conda-build version : 3.21.6
         python version : 3.9.7.final.0
       virtual packages : __win=0=0
                          __archspec=1=x86_64
       base environment : C:\Anaconda3  (writable)
      conda av data dir : C:\Anaconda3\etc\conda
  conda av metadata url : None
           channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/win-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:\Anaconda3\pkgs
                          C:\Users\Work\.conda\pkgs
                          C:\Users\Work\AppData\Local\conda\conda\pkgs
       envs directories : C:\Anaconda3\envs
                          C:\Users\Work\.conda\envs
                          C:\Users\Work\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/4.11.0 requests/2.26.0 CPython/3.9.7 Windows/10 Windows/10.0.19044
          administrator : True
             netrc file : None
           offline mode : False

(_xarray_bug) > conda list
# packages in environment at C:\Anaconda3\envs\_xarray_bug:
#
# Name                    Version                   Build  Channel
bzip2                     1.0.8                h8ffe710_4    conda-forge
ca-certificates           2021.10.8            h5b45459_0    conda-forge
importlib-metadata        4.10.1           py39hcbf5309_0    conda-forge
importlib_metadata        4.10.1               hd8ed1ab_0    conda-forge
intel-openmp              2022.0.0          h57928b3_3663    conda-forge
libblas                   3.9.0              13_win64_mkl    conda-forge
libcblas                  3.9.0              13_win64_mkl    conda-forge
libffi                    3.4.2                h8ffe710_5    conda-forge
liblapack                 3.9.0              13_win64_mkl    conda-forge
libzlib                   1.2.11            h8ffe710_1013    conda-forge
mkl                       2022.0.0           h0e2418a_796    conda-forge
numpy                     1.22.1           py39h6331f09_0    conda-forge
openssl                   3.0.0                h8ffe710_2    conda-forge
pandas                    1.4.0            py39h2e25243_0    conda-forge
pip                       22.0.2             pyhd8ed1ab_0    conda-forge
python                    3.9.10          hcf16a7b_1_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python_abi                3.9                      2_cp39    conda-forge
pytz                      2021.3             pyhd8ed1ab_0    conda-forge
setuptools                60.6.0           py39hcbf5309_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
sqlite                    3.37.0               h8ffe710_0    conda-forge
tbb                       2021.5.0             h2d74725_0    conda-forge
tk                        8.6.11               h8ffe710_1    conda-forge
typing_extensions         4.0.1              pyha770c72_0    conda-forge
tzdata                    2021e                he74cb21_0    conda-forge
ucrt                      10.0.20348.0         h57928b3_0    conda-forge
vc                        14.2                 hb210afc_6    conda-forge
vs2015_runtime            14.29.30037          h902a5da_6    conda-forge
wheel                     0.37.1             pyhd8ed1ab_0    conda-forge
xarray                    0.21.0             pyhd8ed1ab_0    conda-forge
xz                        5.2.5                h62dcd97_1    conda-forge
zipp                      3.7.0              pyhd8ed1ab_0    conda-forge

[H0R5E]

Never mind. For those that follow there is already an issue in the feedstock repo.

Also #6207.