all: update golang.zx2c4.com/wireguard to github.com/tailscale/wireguard-go (#6692)

This is temporary while we work to upstream performance work in
https://github.com/WireGuard/wireguard-go/pull/64. A replace directive
is less ideal as it breaks dependent code without duplication of the
directive.

Signed-off-by: Jordan Whited <jordan@tailscale.com>

tsnet/tsnet.go

@@ -121,8 +121,8 @@ func (s *Server) Dial(ctx context.Context, network, address string) (net.Conn, e
 // This is useful if you need to have your tsnet services connect to other devices on
 // your tailnet.
 func (s *Server) HTTPClient() *http.Client {
-	return &http.Client {
-		Transport: &http.Transport {
+	return &http.Client{
+		Transport: &http.Transport{
 			DialContext: s.Dial,
 		},
 	}