"packaging" lib is needed by the oci-env generate-client command

[decko]

Without "packaging" installed in the same virtual environment for the oci_env CLI we get this message after trying to run the generate-client command:

Generating python-client for pulpcore.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  799k  100  799k    0     0   795k      0  0:00:01  0:00:01 --:--:--  795k
::group::BINDINGS
Unnormalized Version: 3.60.0.dev
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'packaging'```

[lubosmj]

This was added in #161 and #165.

[lubosmj]

Closing in accordance with the merging of #165.