CompatHelper: bump compat for NLPModels to 0.20, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the NLPModels package from 0.18, 0.19 to 0.18, 0.19, 0.20. 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.

[github-actions[bot]]

Package name	latest	stable
CaNNOLeS.jl
DCISolver.jl
DerivativeFreeSolvers.jl
JSOSolvers.jl
NLPModelsIpopt.jl
OptimizationProblems.jl
Percival.jl
QuadraticModels.jl
SolverBenchmark.jl
SolverTools.jl

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 :tada:

Comparison is base (a199101) 98.73% compared to head (578683d) 98.74%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #123 +/- ## ========================================== + Coverage 98.73% 98.74% +0.01% ========================================== Files 8 8 Lines 1029 1038 +9 ========================================== + Hits 1016 1025 +9 Misses 13 13 ``` [see 2 files with indirect coverage changes](https://codecov.io/gh/JuliaSmoothOptimizers/ADNLPModels.jl/pull/123/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers)

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