[tz] Announcing global-tz - 2022ag (beta)

[Paul Eggert]

On 3/18/22 09:00, Stephen Colebourne via tz wrote:
> 2022ag-beta1, which will become the
> final 2022ag release tomorrow if there are no major issues or
> objections.

That naming convention would collide with tzdb's already-existing naming 
convention, if we are unlucky to have 33 or more releases this year. A 
name like '2022a-g' would avoid any such collision.