Bump Security String to 2022-04-05

Implemented:
============
CVE:            References:    Type:  Severity:  Updated AOSP versions:
CVE-2021-0694   A-183147114    EoP    High       11
CVE-2021-39794  A-205836329    EoP    High       11, 12, 12L
CVE-2021-39795  A-201667614    EoP    High       11, 12, 12L
CVE-2021-39796  A-205595291    EoP    High       10, 11, 12, 12L
CVE-2021-39803  A-193790350    ID     High       10, 11, 12, 12L
CVE-2021-39804  A-215002587    DoS    High       11, 12, 12L
CVE-2021-39807  A-209446496    EoP    High       10, 11, 12, 12L
CVE-2021-39808  A-209966086    EoP    High       10, 11, 12
CVE-2021-39809  A-205837191    ID     High       10, 11, 12, 12L

Not Implemented:
================
None

Not Applicable (platform source):
=================================
CVE:            References:    Type:  Severity:  Updated AOSP versions:
CVE-2021-39797  A-209607104    EoP    High       12, 12L
CVE-2021-39798  A-213169612    EoP    High       12, 12L
CVE-2021-39799  A-200288596    EoP    High       12, 12L
CVE-2021-39805  A-212694559    ID     High       12, 12L

Change-Id: I1ced2eaeaa39cc65de434555db850e3bfce603b6

core/version_defaults.mk

@@ -240,7 +240,7 @@ ifndef PLATFORM_SECURITY_PATCH
     #  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 := 2022-03-05
+      PLATFORM_SECURITY_PATCH := 2022-04-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH