ci: bump deprecated ubuntu 20.04

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

enable CI again :)

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72%. Comparing base (db5d275) to head (7eaacfc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #388   +/-   ##
===================================
  Coverage    72%    72%           
===================================
  Files         2      2           
  Lines       441    441           
===================================
  Hits        316    316           
  Misses      125    125           

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