Update dependencies.

go.mod

@@ -3,13 +3,13 @@ module github.com/jech/galene
 go 1.13
 
 require (
-	github.com/at-wat/ebml-go v0.15.0
+	github.com/at-wat/ebml-go v0.16.0
 	github.com/gorilla/websocket v1.4.2
-	github.com/pion/ice/v2 v2.0.15
+	github.com/pion/ice/v2 v2.1.5
 	github.com/pion/rtcp v1.2.6
 	github.com/pion/rtp v1.6.2
 	github.com/pion/sdp/v3 v3.0.4
 	github.com/pion/turn/v2 v2.0.5
-	github.com/pion/webrtc/v3 v3.0.12
-	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
+	github.com/pion/webrtc/v3 v3.0.23
+	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b
 )