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 80.49%. Comparing base (52d9f8e) to head (30e78fb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   80.49%   80.49%           
=======================================
  Files           8        8           
  Lines         523      523           
=======================================
  Hits          421      421           
  Misses        102      102           

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