Dockerfile: update xx to 1.2.1

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Dockerfile

@@ -3,7 +3,7 @@
 ARG GO_VERSION=1.20.3
 ARG BASE_DEBIAN_DISTRO="bullseye"
 ARG GOLANG_IMAGE="golang:${GO_VERSION}-${BASE_DEBIAN_DISTRO}"
-ARG XX_VERSION=1.1.2
+ARG XX_VERSION=1.2.1
 
 ARG VPNKIT_VERSION=0.5.0
 ARG DOCKERCLI_VERSION=v17.06.2-ce