src: continued use of Subversion for getting updates

[Graham Perrin]

On 23/12/2020 00:10, Paul Mather wrote:
> … continue to get src updates via Subversion. …

As far as I can tell:

* for stable/12 alone

* for a limited period.

<https://github.com/bsdimp/freebsd-git-docs/blob/4833066feda51cc3a907cf7bff1c4344b3edd5c6/big-picture.md#L103>

In context: 
<https://github.com/bsdimp/freebsd-git-docs/blob/main/big-picture.md>