Bump Security String to 2019-10-05

Implemented:
============
CVE:            References:     Type:   Severity:       Updated AOSP versions:
CVE-2019-2173   A-123013720     EoP     High            7.1.1, 7.1.2, 8.0, 8.1, 9
CVE-2019-2184   A-134578122     RCE     Critical        7.1.1, 7.1.2, 8.0, 8.1, 9
CVE-2019-2185   A-136173699     RCE     Critical        7.1.1, 7.1.2, 8.0, 8.1, 9
CVE-2019-2186   A-136175447     RCE     Critical        7.1.1, 7.1.2, 8.0, 8.1, 9
CVE-2019-2187   A-124940143     ID      High            7.1.1, 7.1.2, 8.0, 8.1, 9, 10

Not Implemented:
================
CVE:            References:     Type:   Severity:       Updated AOSP versions:
None

Not Applicable (platform source):
=================================
CVE:            References:     Type:   Severity:       Updated AOSP versions:
CVE-2019-2110   A-69703445      ID      High            9
CVE-2019-2114   A-123700348     EoP     High            8.0, 8.1, 9

Change-Id: Ic0c43e5b0fdaca92a58b48abd3a2f9fb2a67af9e