Update admin, control, and bootstrap containers

[jpculp]

Description of changes:

This updates the containers that were just released ⤵︎

Bootstrap Container: v0.2.16
Admin Container: v0.20.6
Control Container: v0.20.6

Testing done:

apiclient get settings.bootstrap-containers

{
  "settings": {
    "bootstrap-containers": {
      "bear": {
        "mode": "once",
        "source": "328549459982.dkr.ecr.us-west-2.amazonaws.com/bottlerocket-bootstrap:v0.2.16",
        "user-data": "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"
      }
    }
  }

apiclient get settings.host-containers

{
  "settings": {
    "host-containers": {
      "admin": {
        "enabled": true,
        "source": "328549459982.dkr.ecr.us-west-2.amazonaws.com/bottlerocket-admin:v0.20.6",
        "superpowered": true,
        "user-data": XXXXXXXX
      },
      "control": {
        "enabled": true,
        "source": "328549459982.dkr.ecr.us-west-2.amazonaws.com/bottlerocket-control:v0.20.6",
        "superpowered": false
      }
    }
  }
}

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.