Bump Golang 1.11.6

go1.11.6 (released 2019/03/14) includes fixes to cgo, the compiler, linker,
runtime, go command, and the crypto/x509, encoding/json, net, and net/url
packages. See the Go 1.11.6 milestone on our issue tracker for details:

https://github.com/golang/go/issues?q=milestone%3AGo1.11.6

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 1500105)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

appveyor.yml

@@ -4,7 +4,7 @@ clone_folder: c:\gopath\src\github.com\docker\cli
 
 environment:
   GOPATH: c:\gopath
-  GOVERSION: 1.11.5
+  GOVERSION: 1.11.6
   DEPVERSION: v0.4.1
 
 install:

dockerfiles/Dockerfile.binary-native

@@ -1,4 +1,4 @@
-FROM    golang:1.11.5-alpine
+FROM    golang:1.11.6-alpine
 
 RUN     apk add -U git bash coreutils gcc musl-dev
 

dockerfiles/Dockerfile.cross

@@ -1,4 +1,4 @@
-FROM	dockercore/golang-cross:1.11.5@sha256:17a7e0f158521c50316a0d0c1ab1f6a75350b4d82e7ef03c98bcfbdf04feb4f3
+FROM	dockercore/golang-cross:1.11.6@sha256:fc07992ec18c0695fe748460cb3d599178d138ba2c762098283bc49334d7b072
 ENV     DISABLE_WARN_OUTSIDE_CONTAINER=1
 WORKDIR /go/src/github.com/docker/cli
 COPY    . .

dockerfiles/Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM    golang:1.11.5-alpine
+FROM    golang:1.11.6-alpine
 
 RUN     apk add -U git make bash coreutils ca-certificates curl
 

dockerfiles/Dockerfile.e2e

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.11.5
+ARG GO_VERSION=1.11.6
 
 FROM docker/containerd-shim-process:a4d1531 AS containerd-shim-process
 

dockerfiles/Dockerfile.lint

@@ -1,4 +1,4 @@
-FROM    golang:1.11.5-alpine
+FROM    golang:1.11.6-alpine
 
 RUN     apk add -U git