CompatHelper: bump compat for "GPUArrays" to "6.2"

[github-actions[bot]]

This pull request changes the compat entry for the GPUArrays package from 3.1, 4.0, 5.0 to 3.1, 4.0, 5.0, 6.2.

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.