[automerger skipped] Update Security String to 2021-08-01 am: 719f8e6f am: 731c612c am: 2b5cc45a am: d4f2c304 -s ours am: 4c6a6534 -s ours am: c2c92bc5 -s ours

am skip reason: Merged-In Ieba9625ca0ccedf285209954f1e766b20455c32f with SHA-1 f5139e30 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/14967096

Change-Id: Id998e7d3494e7f20ab5fe56ec26c3644017880ca