Update Security String to 2021-07-01 am: 5edc0cec47 am: d8033580ae

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/14694771

Change-Id: Ic69e33d14bfd68cd1bde31c774dacb92da50771f
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 81ca28d..037b0aa 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -250,7 +250,7 @@
     #  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 := 2021-06-01
+      PLATFORM_SECURITY_PATCH := 2021-07-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH