Update dependency io.getstream:stream-webrtc-android to v1.3.9

Author: renovate[bot]

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ jetty-alpn-openjdk8 = "9.4.58.v20250814"
 tomcat = "9.0.108"
 tomcat-jakarta = "10.1.44"
 
-stream-webrtc-android = "1.3.8"
+stream-webrtc-android = "1.3.9"
 
 apache = "4.1.5"
 apache5 = "5.5"