Update Security String to 2020-10-05

Bug: 163542576
Change-Id: Id3cbd4d6528f827eba6ac410ba2eb92d91d40901
(cherry picked from commit 5eec497aa443486de046ec6845c65e78f2df694c)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index e867ebb..fc6a18f 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -240,7 +240,7 @@
     #  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 := 2020-10-01
+      PLATFORM_SECURITY_PATCH := 2020-10-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH