Update Security String to 2021-06-05

Bug: 185154903
Change-Id: Ibfaf0bcc7e4525786eca62cafc7548030be40c61
(cherry picked from commit deaeaecae3f74a1cd3602acb3a2a30c9b906f790)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index b32474d..8e40fa7 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 := 2021-05-05
+      PLATFORM_SECURITY_PATCH := 2021-06-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH