go.mod: bump inetaf/tcpproxy

To fix a logging crash.

Updates tailscale/corp#20503

Change-Id: I1beafe34afeb577aaaf6800a408faf6454b16912
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