CompatHelper: bump compat for Singular to 0.27, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Singular package from 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26 to 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.92%. Comparing base (b5f1551) to head (c275a2d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   76.92%   76.92%           
=======================================
  Files           1        1           
  Lines          26       26           
=======================================
  Hits           20       20           
  Misses          6        6           

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