Update Security String to 2021-11-01 am: bdb63576ff am: 51b1e117c7 am: 5593bbe1f7 am: e297219ec0

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/15845733

Change-Id: Ie154e0884c9b69e7e5c6f0306b45f5076a604a63
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 4a00f44..219f73b 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 := 2021-10-01
+      PLATFORM_SECURITY_PATCH := 2021-11-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH