Update proguard rules to include NIST SDP parser (#317)

Also update Okhttp to 4.12.0 to fix r8 issues.

@@ -148,7 +148,7 @@ dependencies {
     implementation deps.coroutines.lib
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:${versions.serialization}"
     api 'io.github.webrtc-sdk:android:114.5735.05'
-    api "com.squareup.okhttp3:okhttp:4.10.0"
+    api "com.squareup.okhttp3:okhttp:4.12.0"
     api 'com.github.davidliu:audioswitch:89582c47c9a04c62f90aa5e57251af4800a62c9a'
     implementation deps.androidx.annotation
     implementation "androidx.core:core:${versions.androidx_core}"

@@ -24,6 +24,12 @@
 #########################################
 -keep class org.webrtc.** { *; }
 
+# NIST sdp parser
+#########################################
+-keep class android.gov.nist.** { *; }
+-dontwarn com.sun.nio.sctp.**
+-dontwarn org.apache.log4j.**
+
 # Protobuf
 #########################################
--keep class * extends com.google.protobuf.GeneratedMessageLite { *; }
\ No newline at end of file
+-keep class * extends com.google.protobuf.GeneratedMessageLite { *; }