[19.03 backport] update Golang 1.12.12 (CVE-2019-17596) (#400)

[19.03 backport] update Golang 1.12.12 (CVE-2019-17596)
Upstream-commit: a6743090d7f6514e2be1df7aad33db1f91e1c3b0
Component: packaging

Author: seemethere

components/packaging/common.mk

@@ -2,7 +2,7 @@ ARCH=$(shell uname -m)
 BUILDTIME=$(shell date -u -d "@$${SOURCE_DATE_EPOCH:-$$(date +%s)}" --rfc-3339 ns 2> /dev/null | sed -e 's/ /T/')
 DEFAULT_PRODUCT_LICENSE:=Community Engine
 DOCKER_GITCOMMIT:=abcdefg
-GO_VERSION:=1.12.10
+GO_VERSION:=1.12.12
 PLATFORM=Docker Engine - Community
 SHELL:=/bin/bash
 VERSION?=0.0.0-dev