CompatHelper: bump compat for POMDPs to 1, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the POMDPs package from 0.9 to 0.9, 1.
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 90.20%. Comparing base (e62ac76) to head (a9c84b7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   90.20%   90.20%           
=======================================
  Files           9        9           
  Lines         490      490           
=======================================
  Hits          442      442           
  Misses         48       48           

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