Default version does not exist for amd64

Looks like this commit is at least an invalid version for amd64 https://github.com/tailscale/github-action/commit/6ecfb8d7e8bdbfdd874e56d42ecd633cbbb85a1c

This makes the action try to download https://pkgs.tailscale.com/stable/tailscale_1.64.2_amd64.tgz which is not found