[tz] proposal for new tzdb versions

[Paul Goyette]

On Thu, 23 Sep 2021, Almaz Mingaleev via tz wrote:

> For Android having 2021a1 and 2021b would be inconvenient. Because
> there are hardcoded places which expect that tzdata version is exactly
> 5 characters. And we can't update that code along with time zone files.

If so, you already have a potential problem, since in a busy year of
changes we would have ..., 2021y, 2021z, 2021za, 2021zb, ...


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