CompatHelper: bump compat for FillArrays to 1 for package test, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the FillArrays package from 0.11, 0.12, 0.13 to 0.11, 0.12, 0.13, 1 for package test. 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[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -97.64 :warning:

Comparison is base (7ddcc5a) 97.63% compared to head (c7fa0bc) 0.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #359 +/- ## ========================================== - Coverage 97.63% 0.00% -97.64% ========================================== Files 10 10 Lines 380 367 -13 ========================================== - Hits 371 0 -371 - Misses 9 367 +358 ``` [see 10 files with indirect coverage changes](https://codecov.io/gh/JuliaGaussianProcesses/AbstractGPs.jl/pull/359/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGaussianProcesses) 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=JuliaGaussianProcesses). 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=JuliaGaussianProcesses)

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[theogf]

Superseded by #358