Reduce CI jobs

[samuelcolvin]

test 1.56 on ubuntu only

[codecov]

Codecov Report

Merging #209 (eb8771c) into main (eb8771c) will not change coverage.
The diff coverage is n/a.

❗ Current head eb8771c differs from pull request most recent head 7b8f1eb. Consider uploading reports for the commit 7b8f1eb to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #209   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          391       391           
  Branches        82        82           
=========================================
  Hits           391       391           

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