Update Security String to 2023-10-01 am: e257bf1863 am: e3e3c51f6d

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/24426048

Change-Id: Ic024fe708d4bb66efb04413096bae0706feb4df9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index b5fa3eb..1c56215 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -103,7 +103,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-    PLATFORM_SECURITY_PATCH := 2023-09-01
+    PLATFORM_SECURITY_PATCH := 2023-10-01
 endif
 
 include $(BUILD_SYSTEM)/version_util.mk