Update migration script to 1.0.0-rc02/2.18.4

PiperOrigin-RevId: 513482096
(cherry picked from commit b634005c)

media3-migration.sh

@@ -128,8 +128,8 @@ extension-workmanager media3-exoplayer-workmanager'
 # Rewrites classes, packages and dependencies from the legacy ExoPlayer package structure
 # to androidx.media3 structure.
 
-MEDIA3_VERSION="1.0.0-beta03"
-LEGACY_PEER_VERSION="2.18.2"
+MEDIA3_VERSION="1.0.0-rc02"
+LEGACY_PEER_VERSION="2.18.4"
 
 function usage() {
   echo "usage: $0 [-p|-c|-d|-v]|[-m|-l [-x <path>] [-f] PROJECT_ROOT]"