CompatHelper: bump compat for GAP to 0.11, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GAP package from 0.7, 0.8, 0.9.3, 0.10 to 0.7, 0.8, 0.9.3, 0.10, 0.11.
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 (fced6a6) to head (8dd96e5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   73.07%   76.92%   +3.84%     
==========================================
  Files           1        1              
  Lines          26       26              
==========================================
+ Hits           19       20       +1     
+ Misses          7        6       -1     

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