Handle ioutil deprecations (#53526)

* replace ioutil.ReadFile -> os.ReadFile

* replace ioutil.ReadAll -> io.ReadAll

* replace ioutil.TempFile -> os.CreateTemp

* replace ioutil.NopCloser -> io.NopCloser

* replace ioutil.WriteFile -> os.WriteFile

* replace ioutil.TempDir -> os.MkdirTemp

* replace ioutil.Discard -> io.Discard

scripts/build/release_publisher/externalrelease.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strings"
 	"time"
@@ -62,7 +62,7 @@ func (getHTTPContents) getContents(url string) (string, error) {
 	}
 
 	defer response.Body.Close()
-	all, err := ioutil.ReadAll(response.Body)
+	all, err := io.ReadAll(response.Body)
 	if err != nil {
 		return "", err
 	}

scripts/build/release_publisher/publisher.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"strings"
@@ -276,7 +276,7 @@ func (p *publisher) postRequest(url string, obj interface{}, desc string) error
 
 	if res.Body != nil {
 		defer res.Body.Close()
-		body, err := ioutil.ReadAll(res.Body)
+		body, err := io.ReadAll(res.Body)
 		if err != nil {
 			return err
 		}

scripts/openapi3/openapi3conv.go

@@ -3,11 +3,11 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"os"
+
 	"github.com/getkin/kin-openapi/openapi2"
 	"github.com/getkin/kin-openapi/openapi2conv"
 	"github.com/getkin/kin-openapi/openapi3"
-	"io/ioutil"
-	"os"
 )
 
 // main This simple script will take the swagger v2 spec generated by grafana and convert them into openapi 3
@@ -30,7 +30,7 @@ func main() {
 	}
 
 	fmt.Printf("Reading swagger 2 file %s\n", inFile)
-	byt, err := ioutil.ReadFile(inFile)
+	byt, err := os.ReadFile(inFile)
 	if err != nil {
 		panic(err)
 	}
@@ -54,7 +54,7 @@ func main() {
 		panic(err)
 	}
 
-	if err = ioutil.WriteFile(outFile, j3, 0644); err != nil {
+	if err = os.WriteFile(outFile, j3, 0644); err != nil {
 		panic(err)
 	}
 	fmt.Printf("OpenAPI specs generated in file %s\n", outFile)