omni: switch branch refs to android-14.0

Change-Id: Icf23a1368e21dcdb29df0bc3a2010323332723fd
diff --git a/utils/aosp-merge.sh b/utils/aosp-merge.sh
index 519401c..9e5da6b 100755
--- a/utils/aosp-merge.sh
+++ b/utils/aosp-merge.sh
@@ -24,7 +24,7 @@
 
 branch_name=${ref}"-merge"
 
-branch_current="android-13.0"
+branch_current="android-14.0"
 
 cd ../../../