io/ioutil deprecated (#3217)

tools/goctl/plugin/plugin.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"os/exec"
@@ -171,7 +170,7 @@ func downloadFile(filepath, url string) error {
 // NewPlugin returns contextual resources when written in other languages
 func NewPlugin() (*Plugin, error) {
 	var plugin Plugin
-	content, err := ioutil.ReadAll(os.Stdin)
+	content, err := io.ReadAll(os.Stdin)
 	if err != nil {
 		return nil, err
 	}