Update array functions for Statamic 5 / Laravel 11

[dchymko]

Fixes function array_get() undefined on the second step of the importer when attempting to import the posts.

Is it worth including logic to keep it compatible with < 5.0?

Also, I believe @kevmarsden has some additional fixes that may supersede this one, in which case, this can be closed.

[ryanmitchell]

Would be best for this to merge after #12 and then tidy up the merge conflicts

[kevmarsden]

This PR works as expected as long as the config/statamic-wp-import.php file is renamed to wp-import.php.

There are still some issues with taxonomy imports, so I'll create a separate PR with those fixes once these pending PRs are merged.

[ryanmitchell]

@kevmarsden I've reverted the config changes, looked like a find/replace error to me

[dchymko]

@kevmarsden I've reverted the config changes, looked like a find/replace error to me

I changed the references, because with the plugin namespace/rename change to statamaic-rad-pack today, it was throwing an no hint path defined for error.

If you reinstall the add-on with composer, you should be able to reproduce.

[jackmcdade]

Thank you!