Bump Security String to 2020-07-05

Implemented:
============
CVE:            References:  Type:  Severity:  Updated AOSP versions:
CVE-2020-0224   A-147664838  RCE    Critical   8.0, 8.1, 9, 10
CVE-2020-9589   A-156261521  RCE    Critical   8.0, 8.1, 9, 10

Previously Implemented:
=======================
CVE:            References:  Type:  Severity:  Updated AOSP versions:
CVE-2020-0227   A-129476618  EoP    High       8.0, 8.1, 9, 10

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

Not Applicable (platform source):
=================================
CVE:            References:  Type:  Severity:  Updated AOSP versions:
CVE-2020-0107   A-146570216  ID     High       10
CVE-2020-0122   A-147247775  EoP    High       8.0, 8.1, 9, 10
CVE-2020-0225   A-142546668  RCE    Critical   10
CVE-2020-0226   A-150226994  EoP    High       10

Change-Id: I61dda3cfc3913edbf9cab2f9b649c292c4990656