Migrate root build file to kotlin dsl

[lukstbit]

Purpose / Description

Migrates the root build gradle file to kotlin dsl.
Note: I've done this in a single commit as I don't think it's worth keeping the git history, it's almost only dependencies updates + some tweaks from Mike for CI. This avoids having a commit that doesn't compile in the git history.

How Has This Been Tested?

Synchronized/built the project.

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

Code looks good, treat this as an 'approve' once the macOS CI error is fixed.

I like git history, but build.gradle has always been a mess.
I'd have found this questionable if we had migrated to the version catalog sooner, but it's fine as it is

[david-allison]

Thanks!