Update to Go 1.19

ref: stolostron/backlog#26059
Signed-off-by: Dale Haiducek <[email protected]>

Author: dhaiducek

build/Dockerfile

@@ -1,7 +1,7 @@
 # Stage 1: Use image builder to build the target binaries
 # Copyright Contributors to the Open Cluster Management project
 
-FROM golang:1.18 AS builder
+FROM golang:1.19 AS builder
 
 ENV COMPONENT=governance-policy-framework-addon
 ENV REPO_PATH=/go/src/github.com/open-cluster-management-io/${COMPONENT}

go.mod

@@ -1,6 +1,6 @@
 module open-cluster-management.io/governance-policy-framework-addon
 
-go 1.18
+go 1.19
 
 require (
 	github.com/go-logr/zapr v1.2.3

tool/operator-sdk-port.go

@@ -8,7 +8,6 @@ package tool
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 )
@@ -39,7 +38,7 @@ func GetOperatorNamespace() (string, error) {
 		return "", ErrRunLocal
 	}
 
-	nsBytes, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
+	nsBytes, err := os.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
 	if err != nil {
 		if os.IsNotExist(err) {
 			return "", ErrNoNamespace