[automerger skipped] Update Security String to 2020-12-01 am: bfe242de am: 72b39fb8 am: c4c139cf am: f96ad85d am: 9d2b3fa3 am: edefa3ea -s ours am: 3aa4b89b -s ours

am skip reason: Change-Id I61eac7915ab4b23227c3263d3f33a0f71dc3a107 with SHA-1 29d48ffa is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12804958

Change-Id: I23dcc0bcc5b97b3e2395ccfd23dfb376fca2f5bf