CompatHelper: bump compat for NLPModels to 0.18, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the NLPModels package from 0.17 to 0.17, 0.18.
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-commenter]

Codecov Report

Merging #11 (be635ae) into main (fc332da) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   72.34%   72.34%           
=======================================
  Files           5        5           
  Lines         188      188           
=======================================
  Hits          136      136           
  Misses         52       52           

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