Update go.mod version to 1.19

Relates to pion/webrtc#2292

go.mod

@@ -1,10 +1,20 @@
 module github.com/pion/stun/v2
 
-go 1.12
+go 1.19
 
 require (
 	github.com/pion/dtls/v2 v2.2.10
 	github.com/pion/logging v0.2.2
 	github.com/pion/transport/v3 v3.0.2
 	github.com/stretchr/testify v1.9.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pion/transport/v2 v2.2.4 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

message_test.go

@@ -15,7 +15,6 @@ import (
 	"fmt"
 	"hash/crc64"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
@@ -558,7 +557,7 @@ func loadData(tb testing.TB, name string) []byte {
 			tb.Fatal(errClose)
 		}
 	}()
-	v, err := ioutil.ReadAll(f)
+	v, err := io.ReadAll(f)
 	if err != nil {
 		tb.Fatal(err)
 	}