CompatHelper: bump compat for JLArrays in [extras] to 0.3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JLArrays package from 0.2 to 0.2, 0.3.
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.

[nsajko]

merging this would presumably help with this precompilation warning:

WARNING: Constructor for type "BroadcastStyle" was extended in `JLArrays` without explicit qualification or import.
  NOTE: Assumed "BroadcastStyle" refers to `Broadcast.BroadcastStyle`. This behavior is deprecated and may differ in future versions.
  NOTE: This behavior may have differed in Julia versions prior to 1.12.
  Hint: If you intended to create a new generic function of the same name, use `function BroadcastStyle end`.
  Hint: To silence the warning, qualify `BroadcastStyle` as `Broadcast.BroadcastStyle` in the method signature or explicitly `import Broadcast: BroadcastStyle`.

  1 dependency had output during precompilation:
┌ JLArrays
│  [Output was shown above]
└

[aplavin]

Any idea why CI didn't run here? Actions setup at https://github.com/JuliaArrays/StructArrays.jl/blob/master/.github/workflows/CI.yml looks fine, so maybe it is compathelper-related?

[nsajko]

No idea. One option may be to switch to Dependabot.