fix: Remove references to deprecated io/ioutil pkg (#2867)

* Update benchmark_test

* Updae tar.go

* Update further refs

* Commit next set of replacements

* Reverting changes in vendor folder

* Update integreation_with_context_test.go

* Update k8s_test.go

* Update remaining usages

* Replace conflicting usage of fs local variable

pkg/dockerfile/dockerfile.go

@@ -19,8 +19,9 @@ package dockerfile
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
+	"os"
 	"regexp"
 	"strconv"
 	"strings"
@@ -44,9 +45,9 @@ func ParseStages(opts *config.KanikoOptions) ([]instructions.Stage, []instructio
 		if e != nil {
 			return nil, nil, e
 		}
-		d, err = ioutil.ReadAll(response.Body)
+		d, err = io.ReadAll(response.Body)
 	} else {
-		d, err = ioutil.ReadFile(opts.DockerfilePath)
+		d, err = os.ReadFile(opts.DockerfilePath)
 	}
 
 	if err != nil {

pkg/dockerfile/dockerfile_test.go

@@ -18,7 +18,6 @@ package dockerfile
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"reflect"
 	"testing"
@@ -45,7 +44,7 @@ func Test_ParseStages_ArgValueWithQuotes(t *testing.T) {
 	FROM scratch
 	COPY --from=second /hi2 /hi3
 	`
-	tmpfile, err := ioutil.TempFile("", "Dockerfile.test")
+	tmpfile, err := os.CreateTemp("", "Dockerfile.test")
 	if err != nil {
 		t.Fatal(err)
 	}