Fix CI

[zmoon]

Fix the CI workflow so that it can pass.

Current error message, causing failure even though the main job passes, e.g. here:

Error when evaluating 'runs-on' for job 'core-deps-dev'. .github/workflows/ci.yaml (Line: 62, Col: 14): Unexpected value ''

Changes:

• Give runs-on a value in job core-deps-dev

[codecov]

Codecov Report

Merging #66 (9f84966) into master (c4b1223) will increase coverage by 0.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   78.70%   79.62%   +0.92%     
==========================================
  Files           3        3              
  Lines         324      324              
  Branches       59       59              
==========================================
+ Hits          255      258       +3     
+ Misses         46       43       -3     
  Partials       23       23              

Flag	Coverage Δ
unittests	79.32% <ø> (+0.92%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xmovie/core.py	87.04% <0.00%> (+1.55%)	⬆️

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[jbusecke]

Thanks so much for catching this @zmoon. And again, apologies for the long response time here.

[zmoon]

No problem @jbusecke !