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 0.14 to 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 82.53%. Comparing base (b116b83) to head (2c1539e).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #90   +/-   ##
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  Coverage   82.53%   82.53%           
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  Files           6        6           
  Lines         189      189           
=======================================
  Hits          156      156           
  Misses         33       33           

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