Fix sending videos in API <= 30 (#5186)

This is caused by a bug in the Media3 Transform library: androidx/media#2535

Author: jmartinesp

app/proguard-rules.pro

@@ -42,3 +42,12 @@
 }
 
 -keep class io.element.android.x.di.** { *; }
+
+
+# Keep LogSessionId class and related classes (https://github.com/androidx/media/issues/2535)
+-keep class android.media.metrics.LogSessionId { *; }
+-keep class android.media.metrics.** { *; }
+
+# Keep Media3 classes that use reflection (https://github.com/androidx/media/issues/2535)
+-keep class androidx.media3.** { *; }
+-dontwarn android.media.metrics.**