Merge pull request #940 from fluxcd/k8s.io/api-v0.21.1

Update Go to v1.16 and Kubernetes packages to v1.21.1

.github/workflows/build.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15.x
+          go-version: 1.16.x
       - name: Download modules
         run: |
           go mod download

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.15-alpine as builder
+FROM golang:1.16-alpine as builder
 
 ARG TARGETPLATFORM
 ARG REVISON

go.mod

@@ -1,21 +1,20 @@
 module github.com/fluxcd/flagger
 
-go 1.15
+go 1.16
 
 require (
 	github.com/Masterminds/semver/v3 v3.0.3
 	github.com/aws/aws-sdk-go v1.37.32
 	github.com/davecgh/go-spew v1.1.1
 	github.com/go-logr/zapr v0.3.0
-	github.com/google/go-cmp v0.5.2
-	github.com/prometheus/client_golang v1.9.0
+	github.com/google/go-cmp v0.5.5
+	github.com/prometheus/client_golang v1.11.0
 	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.14.1
-	golang.org/x/tools v0.1.0 // indirect
 	gopkg.in/h2non/gock.v1 v1.0.15
-	k8s.io/api v0.20.4
-	k8s.io/apimachinery v0.20.4
-	k8s.io/client-go v0.20.4
-	k8s.io/code-generator v0.20.4
-	k8s.io/klog/v2 v2.4.0
+	k8s.io/api v0.21.1
+	k8s.io/apimachinery v0.21.1
+	k8s.io/client-go v0.21.1
+	k8s.io/code-generator v0.21.1
+	k8s.io/klog/v2 v2.8.0
 )