ci: Bump Ubuntu version for Python unit tests

[vojtechtrefny]

Ubuntu 20.04 will be removed from GH actions by April 1, 2025. We can switch to 22.04 which still has Python 2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.73%. Comparing base (59fd1c6) to head (c01b18c).
Report is 28 commits behind head on main.

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HEAD has 1 upload less than BASE

Flag	BASE (59fd1c6)	HEAD (c01b18c)
sanity	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #512      +/-   ##
==========================================
- Coverage   16.54%   10.73%   -5.81%     
==========================================
  Files           2        8       +6     
  Lines         284     1946    +1662     
  Branches       79        0      -79     
==========================================
+ Hits           47      209     +162     
- Misses        237     1737    +1500     

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[richm]

@spetrosi can you make this change here - https://github.com/linux-system-roles/.github/blob/main/playbooks/templates/.github/workflows/python-unit-test.yml - and here - https://github.com/linux-system-roles/.github/blob/main/playbooks/role_templates/ha_cluster/.github/workflows/python-unit-test.yml - ?

[spetrosi]

@spetrosi can you make this change here - https://github.com/linux-system-roles/.github/blob/main/playbooks/templates/.github/workflows/python-unit-test.yml - and here - https://github.com/linux-system-roles/.github/blob/main/playbooks/role_templates/ha_cluster/.github/workflows/python-unit-test.yml - ?

linux-system-roles/.github#86, playbooks/role_templates/ha_cluster/.github/workflows/python-unit-test.yml already uses ubuntu-22.04