Update Security String to 2021-11-01

Bug: 199784479
Change-Id: Iaf0b0863f6a4e667a5a8f291e1252d8d2dff1ec6
Merged-In: I7e03900c5d853b32f8fbd75cb591063ba4a27450
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 683cc4d..437c173 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -231,7 +231,7 @@
     #  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 := 2021-10-01
+      PLATFORM_SECURITY_PATCH := 2021-11-01
 endif
 
 ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP