bump golang version to 1.19

Signed-off-by: pigletfly <wangbing.adam@gmail.com>

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ on:
   pull_request:
 
 env:
-  GO_VERSION: "1.18"
+  GO_VERSION: "1.19"
 
 jobs:
   lint:

go.mod

@@ -1,6 +1,6 @@
 module github.com/virtual-kubelet/virtual-kubelet
 
-go 1.17
+go 1.19
 
 require (
 	contrib.go.opencensus.io/exporter/jaeger v0.2.1

node/api/metrics_test.go

@@ -16,7 +16,7 @@ package api_test
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -125,7 +125,7 @@ func TestHandlePodMetricsResource(t *testing.T) {
 			assert.Equal(t, tc.expectedStatusCode, rr.Code)
 
 			if tc.expectedError != nil {
-				bodyBytes, err := ioutil.ReadAll(rr.Body)
+				bodyBytes, err := io.ReadAll(rr.Body)
 				require.NoError(t, err)
 				assert.Contains(t, string(bodyBytes), tc.expectedError.Error())
 			} else if tc.expectedStatusCode == http.StatusOK {