fix: remove failing quality test for unsupported, obsolete Python version

[rfulwell]

Description

Python 3.8 is no longer supported. See:
https://endoflife.date/python
This change simply removes the failing quality test from the GitHub Action related to that version.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested by verifying that the old 3.8 quality test is no longer run in the automated pipeline.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works