Fix staticcheck warning for io/ioutil deprecation

logger.go

diff --git a/logger.go b/logger.go
index 0c478be..917644f 100644
--- a/logger.go
+++ b/logger.go
@@ -5,7 +5,7 @@
 package subcommands
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 )
 
@@ -27,5 +27,5 @@
 // VoidStdLog sets an output that will be ignored. This permits ignoring any
 // log.*() calls that would inhibit efficient use of t.Parallel().
 func VoidStdLog() {
-	log.SetOutput(ioutil.Discard)
+	log.SetOutput(io.Discard)
 }

sample-complex/main.go

diff --git a/sample-complex/main.go b/sample-complex/main.go
index 39e4384..c75202e 100644
--- a/sample-complex/main.go
+++ b/sample-complex/main.go
@@ -8,7 +8,7 @@
 
 import (
 	"flag"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 
@@ -68,6 +68,6 @@
 
 func main() {
 	subcommands.KillStdLog()
-	s := &sampleComplexApplication{application, log.New(ioutil.Discard, "", log.LstdFlags|log.Lmicroseconds)}
+	s := &sampleComplexApplication{application, log.New(io.Discard, "", log.LstdFlags|log.Lmicroseconds)}
 	os.Exit(subcommands.Run(s, nil))
 }

sample-simple/main_test.go

diff --git a/sample-simple/main_test.go b/sample-simple/main_test.go
index eb70421..06584a8 100644
--- a/sample-simple/main_test.go
+++ b/sample-simple/main_test.go
@@ -5,7 +5,7 @@
 package main
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"testing"
@@ -20,7 +20,7 @@
 // TODO(maruel): Create an in-memory os.File, couldn't quickly find a ready
 // made fake only.
 func newTempFile(t testing.TB) *os.File {
-	f, err := ioutil.TempFile("", "sample-simple")
+	f, err := os.CreateTemp("", "sample-simple")
 	ut.AssertEqual(t, nil, err)
 	return f
 }
@@ -38,7 +38,7 @@
 
 func assertStdout(t testing.TB, expected string) {
 	_, _ = os.Stdout.Seek(0, 0)
-	actual, err := ioutil.ReadAll(os.Stdout)
+	actual, err := io.ReadAll(os.Stdout)
 	ut.AssertEqual(t, nil, err)
 	ut.AssertEqual(t, expected, string(actual))
 }