Update Golang 1.13.8

full diff: https://github.com/golang/go/compare/go1.13.7...go1.13.8

go1.13.8 (released 2020/02/12) includes fixes to the runtime, the crypto/x509,
and net/http packages. See the Go 1.13.8 milestone on the issue tracker for details.

https://github.com/golang/go/issues?q=milestone%3AGo1.13.8+label%3ACherryPickApproved

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.1.3-experimental
 
 ARG CROSS="false"
-ARG GO_VERSION=1.13.7
+ARG GO_VERSION=1.13.8
 ARG DEBIAN_FRONTEND=noninteractive
 ARG VPNKIT_DIGEST=e508a17cfacc8fd39261d5b4e397df2b953690da577e2c987a47630cd0c42f8e
 ARG DOCKER_BUILDTAGS="apparmor seccomp selinux"

Dockerfile.e2e

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.13.7
+ARG GO_VERSION=1.13.8
 
 FROM golang:${GO_VERSION}-alpine AS base
 ENV GO111MODULE=off

Dockerfile.simple

@@ -5,7 +5,7 @@
 
 # This represents the bare minimum required to build and test Docker.
 
-ARG GO_VERSION=1.13.7
+ARG GO_VERSION=1.13.8
 
 FROM golang:${GO_VERSION}-stretch
 ENV GO111MODULE=off

Dockerfile.windows

@@ -165,7 +165,7 @@ FROM microsoft/windowsservercore
 # Use PowerShell as the default shell
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 
-ARG GO_VERSION=1.13.7
+ARG GO_VERSION=1.13.8
 ARG GOTESTSUM_COMMIT=v0.3.5
 
 # Environment variable notes: