[tools] Replace deprecated ioutil methods

ioutil was deprecated in Go 1.16. This change modifies tools/ to use the
new functions.

Bug: b/235863442
Change-Id: I6bcbe2a7133d8e3656ba8c3a59b2acc6da172044
Reviewed-on: https://fuchsia-review.googlesource.com/c/tools/+/712402
Fuchsia-Auto-Submit: Chris Lewis <cflewis@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Yuping Zhai <yupingz@google.com>
diff --git a/buildidtool/cmd/main.go b/buildidtool/cmd/main.go
index cdaa131..4c2f407 100644
--- a/buildidtool/cmd/main.go
+++ b/buildidtool/cmd/main.go
@@ -9,7 +9,6 @@
 	"encoding/hex"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -109,7 +108,7 @@
 }
 
 func removeOldFile(newBuildID, suffix string) error {
-	data, err := ioutil.ReadFile(stamp)
+	data, err := os.ReadFile(stamp)
 	if err != nil {
 		if !os.IsNotExist(err) {
 			return err
diff --git a/debugsyms/cmd/job_test.go b/debugsyms/cmd/job_test.go
index 20d62a7..e7aa63a 100644
--- a/debugsyms/cmd/job_test.go
+++ b/debugsyms/cmd/job_test.go
@@ -7,7 +7,6 @@
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"testing"
@@ -18,7 +17,7 @@
 func TestJob(t *testing.T) {
 	buildID := "foo"
 	filename := fmt.Sprintf("%s.debug", buildID)
-	tmpFile, err := ioutil.TempFile("", filename)
+	tmpFile, err := os.CreateTemp("", filename)
 	if err != nil {
 		t.Fatalf("Failed to create tempfile: %v", err)
 	}
diff --git a/debugsyms/cmd/upload_test.go b/debugsyms/cmd/upload_test.go
index f75557f..26aff3a 100644
--- a/debugsyms/cmd/upload_test.go
+++ b/debugsyms/cmd/upload_test.go
@@ -6,7 +6,6 @@
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -17,7 +16,7 @@
 func TestQueue(t *testing.T) {
 	buildID := "foo"
 	filename := fmt.Sprintf("%s.debug", buildID)
-	tmpFile, err := ioutil.TempFile("", filename)
+	tmpFile, err := os.CreateTemp("", filename)
 	if err != nil {
 		t.Fatalf("Failed to create tempfile: %v", err)
 	}
diff --git a/debugsyms/cmd/worker_test.go b/debugsyms/cmd/worker_test.go
index 2a0ef84..b032b83 100644
--- a/debugsyms/cmd/worker_test.go
+++ b/debugsyms/cmd/worker_test.go
@@ -7,7 +7,6 @@
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"reflect"
 	"sync"
@@ -54,7 +53,7 @@
 func TestWorker(t *testing.T) {
 	buildID := "foo"
 	filename := fmt.Sprintf("%s.debug", buildID)
-	tmpFile, err := ioutil.TempFile("", filename)
+	tmpFile, err := os.CreateTemp("", filename)
 	if err != nil {
 		t.Fatalf("failed to create tempfile: %v", err)
 	}