Feature Request: Include version updating from when running uv self update

[notatallshaw]

Very minor quality of life request, when you run uv self update it gives you an output like:

info: Checking for updates...
success: Upgraded `uv` to v0.2.20! https://github.com/astral-sh/uv/releases/tag/0.2.20

But it never told me what version I updated from, sometimes when I'm logging into an environment I've not logged into for a little bit I don't remember what uv version I was on.

Mostly this is a personal preference, but occasionally it's a little harder to identify where a fix or a regression happened because I don't know one of my two data points.

[zanieb]

If you use uv self update -v we'll display the current version before doing anything (and not include much else). Fair request though!