Upgrade go dependencies (#644)

* update pion WebRTC from v3 to v4.

* update mapstructure dependency to use go-viper version.

* update go-chi dependency to v5.

server/pkg/types/codec/codecs.go

@@ -3,7 +3,7 @@ package codec
 import (
 	"strings"
 
-	"github.com/pion/webrtc/v3"
+	"github.com/pion/webrtc/v4"
 )
 
 var RTCPFeedback = []webrtc.RTCPFeedback{

server/pkg/types/message/messages.go

@@ -1,7 +1,7 @@
 package message
 
 import (
-	"github.com/pion/webrtc/v3"
+	"github.com/pion/webrtc/v4"
 
 	"github.com/m1k1o/neko/server/pkg/types"
 )

server/pkg/types/webrtc.go

@@ -3,7 +3,7 @@ package types
 import (
 	"errors"
 
-	"github.com/pion/webrtc/v3"
+	"github.com/pion/webrtc/v4"
 )
 
 var (

server/pkg/utils/deocde.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"reflect"
 
-	"github.com/mitchellh/mapstructure"
+	"github.com/go-viper/mapstructure/v2"
 )
 
 func Decode(input interface{}, output interface{}) error {