Modify SKIP variable in Check.yml workflow

[fredrikekre]

Updated SKIP environment variable to exclude runic and runic-md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.46%. Comparing base (a4fdff4) to head (2e0766f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1326   +/-   ##
=======================================
  Coverage   94.46%   94.46%           
=======================================
  Files          40       40           
  Lines        6843     6843           
=======================================
  Hits         6464     6464           
  Misses        379      379           

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