CompatHelper: bump compat for InfiniteArrays to 0.15, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the InfiniteArrays package from 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14 to 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15.
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 25.67%. Comparing base (31f75fc) to head (a5794db).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #131       +/-   ##
===========================================
+ Coverage    0.00%   25.67%   +25.67%     
===========================================
  Files          15       15               
  Lines        1230     1192       -38     
===========================================
+ Hits            0      306      +306     
+ Misses       1230      886      -344     

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