Update Security String to 2020-12-05 am: 29d48ffac5 am: 9841d4bcfa

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12819559

Change-Id: Ib2d68506ba2f0ab27987e5cfe6e8e16bf76b52f3
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index d3ad4f4..30b7da6 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 := 2020-11-05
+      PLATFORM_SECURITY_PATCH := 2020-12-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH