all: Remove usage of deprecated io/ioutil (#7971)

As of Go 1.16 io/ioutil is deprecated. This replaces usage with the
corresponding functions in package os and package io.

script/authors.go

@@ -15,7 +15,7 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"math"
 	"os"
@@ -108,7 +108,7 @@ func main() {
 	bs := readAll(htmlFile)
 	bs = authorsRe.ReplaceAll(bs, []byte("id=\"contributor-list\">\n"+replacement+"\n    </div>"))
 
-	if err := ioutil.WriteFile(htmlFile, bs, 0644); err != nil {
+	if err := os.WriteFile(htmlFile, bs, 0644); err != nil {
 		log.Fatal(err)
 	}
 
@@ -173,7 +173,7 @@ func readAll(path string) []byte {
 	}
 	defer fd.Close()
 
-	bs, err := ioutil.ReadAll(fd)
+	bs, err := io.ReadAll(fd)
 	if err != nil {
 		log.Fatal(err)
 	}

script/commit-msg.go

@@ -12,7 +12,6 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -31,7 +30,7 @@ func main() {
 		os.Exit(exitError)
 	}
 
-	bs, err := ioutil.ReadFile(os.Args[1])
+	bs, err := os.ReadFile(os.Args[1])
 	if err != nil {
 		fmt.Println("Reading input:", err)
 		os.Exit(exitError)

script/genassets.go

@@ -16,7 +16,6 @@ import (
 	"fmt"
 	"go/format"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -74,7 +73,7 @@ func walkerFor(basePath string) filepath.WalkFunc {
 		}
 
 		if info.Mode().IsRegular() {
-			data, err := ioutil.ReadFile(name)
+			data, err := os.ReadFile(name)
 			if err != nil {
 				return err
 			}

script/prune_mocks.go

@@ -12,7 +12,6 @@ package main
 import (
 	"bufio"
 	"flag"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -51,7 +50,7 @@ func pruneInterfaceCheck(path string, size int64) error {
 	}
 	defer fd.Close()
 
-	tmp, err := ioutil.TempFile(".", "")
+	tmp, err := os.CreateTemp(".", "")
 	if err != nil {
 		return err
 	}

script/transifexdl.go

@@ -12,7 +12,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -140,7 +140,7 @@ func loadValidLangs() []string {
 		log.Fatal(err)
 	}
 	defer fd.Close()
-	bs, err := ioutil.ReadAll(fd)
+	bs, err := io.ReadAll(fd)
 	if err != nil {
 		log.Fatal(err)
 	}