Update Security String to 2020-12-01 am: bfe242def7 am: 72b39fb85f

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12804958

Change-Id: I49077857f43cc753df4277507679bb5911646251
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index c9ecd8b..0bf450b 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -181,7 +181,7 @@
     #  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 := 2020-11-01
+      PLATFORM_SECURITY_PATCH := 2020-12-01
 endif
 
 ifndef PLATFORM_BASE_OS