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 92.15%. Comparing base (16fe1a5) to head (2b63733).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   92.15%   92.15%           
=======================================
  Files          19       19           
  Lines        1860     1860           
=======================================
  Hits         1714     1714           
  Misses        146      146           

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