Pin CI workflow to Ubuntu 22.04

[abrain]

The ubuntu-latest image switched to 24.04 and is missing SVN.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.31%. Comparing base (672903b) to head (588250b).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #374   +/-   ##
==========================================
  Coverage      29.31%   29.31%           
  Complexity      1642     1642           
==========================================
  Files             83       83           
  Lines           6597     6597           
==========================================
  Hits            1934     1934           
  Misses          4663     4663           

Flag	Coverage Δ
integration	10.86% <ø> (ø)
unit	19.64% <ø> (ø)

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