CLOUDP-88995: update k8s controller runtime (#541)

* update k8s controller runtime

* upgrade golang to 1.16

Author: ciprian-tibulca

.github/workflows/go.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
 
     - name: Test api
       run: go test -v ./api/...

go.mod

@@ -1,6 +1,6 @@
 module github.com/mongodb/mongodb-kubernetes-operator
 
-go 1.15
+go 1.16
 
 require (
 	github.com/blang/semver v3.5.1+incompatible
@@ -13,12 +13,12 @@ require (
 	github.com/stretchr/objx v0.3.0
 	github.com/stretchr/testify v1.7.0
 	github.com/xdg/stringprep v1.0.3
-	go.mongodb.org/mongo-driver v1.5.2
+	go.mongodb.org/mongo-driver v1.5.3
 	go.uber.org/zap v1.17.0
-	k8s.io/api v0.20.4
-	k8s.io/apimachinery v0.21.0
-	k8s.io/client-go v0.20.4
-	sigs.k8s.io/controller-runtime v0.8.3
+	k8s.io/api v0.21.1
+	k8s.io/apimachinery v0.21.1
+	k8s.io/client-go v0.21.1
+	sigs.k8s.io/controller-runtime v0.9.0
 	sigs.k8s.io/yaml v1.2.0
 )