Update Go to 1.16.8

This includes additional fixes for CVE-2021-39293.

go1.16.8 (released 2021-09-09) includes a security fix to the archive/zip package,
as well as bug fixes to the archive/zip, go/internal/gccgoimporter, html/template,
net/http, and runtime/pprof packages. See the Go 1.16.8 milestone on the issue
tracker for details:

https://github.com/golang/go/issues?q=milestone%3AGo1.16.8+label%3ACherryPickApproved

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 01fa5d9)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.3
 
 ARG BASE_VARIANT=alpine
-ARG GO_VERSION=1.16.7
+ARG GO_VERSION=1.16.8
 
 FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-${BASE_VARIANT} AS gostable
 FROM --platform=$BUILDPLATFORM golang:1.17rc1-${BASE_VARIANT} AS golatest

appveyor.yml

@@ -4,7 +4,7 @@ clone_folder: c:\gopath\src\github.com\docker\cli
 
 environment:
   GOPATH: c:\gopath
-  GOVERSION: 1.16.7
+  GOVERSION: 1.16.8
   DEPVERSION: v0.4.1
 
 install:

dockerfiles/Dockerfile.binary-native

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.16.7
+ARG GO_VERSION=1.16.8
 
 FROM    golang:${GO_VERSION}-alpine
 

dockerfiles/Dockerfile.dev

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.3
 
-ARG GO_VERSION=1.16.7
+ARG GO_VERSION=1.16.8
 
 FROM golang:${GO_VERSION}-alpine AS golang
 ENV  CGO_ENABLED=0

dockerfiles/Dockerfile.e2e

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.16.7
+ARG GO_VERSION=1.16.8
 
 # Use Debian based image as docker-compose requires glibc.
 FROM golang:${GO_VERSION}-buster

dockerfiles/Dockerfile.lint

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.3
 
-ARG GO_VERSION=1.16.7
+ARG GO_VERSION=1.16.8
 ARG GOLANGCI_LINTER_SHA="v1.21.0"
 
 FROM    golang:${GO_VERSION}-alpine AS build