omni: change branch refs to 13.0

Change-Id: I07996ea076918aae2868a3e8c82d3920d9ab5b0f
diff --git a/utils/fork_aosp.sh b/utils/fork_aosp.sh
index b1596d0..bccada7 100755
--- a/utils/fork_aosp.sh
+++ b/utils/fork_aosp.sh
@@ -4,8 +4,8 @@
 
 # Configuration
 PREFIX=android_
-BRANCH=android-12.1
-SOURCE=android-12.1.0_r<INSERT_CORRECT_TAG>
+BRANCH=android-13.0
+SOURCE=android-13.0.0_r<INSERT_CORRECT_TAG>
 USERNAME=<INSERT USER>
 TOKEN=<INSERT TOKEN>
 MANIFEST=android/default.xml