cancel in-progress runs upon new push

[pca006132]

Thought it is a bit wasteful to keep running the old job when we push some new commits. This will now cancel the old job.

And this removes the parallel limit for some builds, I forgot why they were there in the first place, probably copied from openscad?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.69%. Comparing base (70abe63) to head (85fa898).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1065   +/-   ##
=======================================
  Coverage   84.69%   84.69%           
=======================================
  Files          62       62           
  Lines        9685     9685           
  Branches     1050     1050           
=======================================
  Hits         8203     8203           
  Misses       1482     1482           

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[elalish]

Good idea, thanks!