Switch up ordering DTLS elliptic curves to reduce likelihood of filtering (#1568)

tl;dr. Pion-based traffic is impacted because TOR Snowflake uses Pion
https://github.com/pion/dtls/pull/474

pkg/rtc/transport.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/bep/debounce"
+	"github.com/pion/dtls/v2/pkg/crypto/elliptic"
 	"github.com/pion/ice/v2"
 	"github.com/pion/interceptor"
 	"github.com/pion/interceptor/pkg/cc"
@@ -241,6 +242,10 @@ func newPeerConnection(params TransportParams, onBandwidthEstimator func(estimat
 	se := params.Config.SettingEngine
 	se.DisableMediaEngineCopy(true)
 
+	// Change elliptic curve to improve connectivity
+	// https://github.com/pion/dtls/pull/474
+	se.SetDTLSEllipticCurves(elliptic.X25519, elliptic.P384, elliptic.P256)
+
 	//
 	// Disable SRTP replay protection (https://datatracker.ietf.org/doc/html/rfc3711#page-15).
 	// Needed due to lack of RTX stream support in Pion.