omni: switch branch refs to android-14.0

Change-Id: Icf23a1368e21dcdb29df0bc3a2010323332723fd
diff --git a/utils/aosp-push-merge.sh b/utils/aosp-push-merge.sh
index e7a27a1..e94a223 100755
--- a/utils/aosp-push-merge.sh
+++ b/utils/aosp-push-merge.sh
@@ -25,7 +25,7 @@
 
 url="gerrit.omnirom.org"
 port="29418"
-branch="android-13.0"
+branch="android-14.0"
 
 cd ../../../