net/bosh-bootloader: Update to 6.9.16
Release notes:
- https://github.com/cloudfoundry/bosh-bootloader/releases/tag/v6.9.12
- https://github.com/cloudfoundry/bosh-bootloader/releases/tag/v6.9.13
- https://github.com/cloudfoundry/bosh-bootloader/releases/tag/v6.9.15
- https://github.com/cloudfoundry/bosh-bootloader/releases/tag/v6.9.16
Sponsored by: Pivotal Software, Inc.