ci: run tests on PRs targeting all branches

[pcarranzav]

This would allow us to run the tests on PRs that don't target dev because they depend on other PRs, e.g. #571

[codecov]

Codecov Report

Merging #579 (84e65a2) into dev (5272f4a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #579   +/-   ##
=======================================
  Coverage   90.28%   90.28%           
=======================================
  Files          35       35           
  Lines        1750     1750           
  Branches      291      291           
=======================================
  Hits         1580     1580           
  Misses        170      170           

Flag	Coverage Δ
unittests	90.28% <ø> (ø)

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