Update Security String to 2020-07-01

Bug: 156652977
Change-Id: I81539bf9bd96bdc2e0bca54b506d8a6061f0bfba
(cherry picked from commit 4a475b4740322d3d7e5b6ef79723d68c0d005be6)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 70a8f08..bad92f8 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 := 2020-06-05
+      PLATFORM_SECURITY_PATCH := 2020-07-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH