version: use Go 1.18's git stamping as default implementation

No more manual version bumps!

Fixes #81

Change-Id: I3a9e544a7248f0b83bcbacbaabbc4dabc435e62d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f