pre-commit breaks because 'oras' python lib is missing in the environment where tools/generate_units_documentation.py

This is a side-effect of merging !5633 (merged)

The following discussion from !6619 (closed) should be addressed:

• @service_account_group_59800588_0f6fd8e977a6c86f7522a46f254943dc started a discussion: (+1 comment)

  ⚠️ Artifact update problem

  Renovate failed to update an artifact related to this branch. You probably do not want to merge this MR as-is.

  ♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

  • any of the package files in this branch needs updating, or
  • the branch becomes conflicted, or
  • you click the rebase/retry checkbox if found above, or
  • you rename this MR's title to start with "rebase!" to trigger it manually

  The artifact failure details are included below:

  File name: charts/sylva-units/values.yaml

  Command failed: tools/generate_units_documentation.py
  Traceback (most recent call last):
    File "/builds/sylva-projects/sylva-elements/renovate/renovate/repos/gitlab/sylva-projects/sylva-core/tools/generate_units_documentation.py", line 26, in <module>
      from oras.client import OrasClient
  ModuleNotFoundError: No module named 'oras'