Bump Golang 1.11.9

Full diff: https://github.com/golang/go/compare/go1.11.5...go1.11.9

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

go1.11.7 (released 2019/04/05) includes fixes to the runtime and the net
packages. See the Go 1.11.7 milestone on our issue tracker for details.

https://github.com/golang/go/issues?q=milestone%3AGo1.11.7

go1.11.8 (released 2019/04/08) was accidentally released without its
intended fix. It is identical to go1.11.7, except for its version number.
The intended fix is in go1.11.9.

go1.11.9 (released 2019/04/11) fixes an issue where using the prebuilt
binary releases on older versions of GNU/Linux led to failures when linking
programs that used cgo. Only Linux users who hit this issue need to update.

See golang/go#31293 for details

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

Dockerfile

@@ -24,7 +24,7 @@
 # the case. Therefore, you don't have to disable it anymore.
 #
 
-FROM golang:1.11.5 AS base
+FROM golang:1.11.9 AS base
 # allow replacing httpredir or deb mirror
 ARG APT_MIRROR=deb.debian.org
 RUN sed -ri "s/(httpredir|deb).debian.org/$APT_MIRROR/g" /etc/apt/sources.list

Dockerfile.e2e

@@ -1,5 +1,5 @@
 ## Step 1: Build tests
-FROM golang:1.11.5-alpine3.8 as builder
+FROM golang:1.11.9-alpine3.8 as builder
 
 RUN apk add --update \
     bash \

Dockerfile.simple

@@ -5,7 +5,7 @@
 
 # This represents the bare minimum required to build and test Docker.
 
-FROM golang:1.11.5-stretch
+FROM golang:1.11.9-stretch
 
 # allow replacing httpredir or deb mirror
 ARG APT_MIRROR=deb.debian.org

Dockerfile.windows

@@ -161,7 +161,7 @@ SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPref
 # Environment variable notes:
 #  - GO_VERSION must be consistent with 'Dockerfile' used by Linux.
 #  - FROM_DOCKERFILE is used for detection of building within a container.
-ENV GO_VERSION=1.11.5 `
+ENV GO_VERSION=1.11.9 `
     GIT_VERSION=2.11.1 `
     GOPATH=C:\go `
     FROM_DOCKERFILE=1