Update Security String to 2020-10-01 am: d935b454f2

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12488862

Change-Id: Ie383ac5500cea357422d0ba39e22d07813408ec3
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index c945779..5ccaa98 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -186,7 +186,7 @@
     #  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 := 2019-07-05
+      PLATFORM_SECURITY_PATCH := 2020-10-01
 endif
 
 ifndef PLATFORM_BASE_OS