build: bump bitflags from 1.1.0 to 1.2.0
build: bump bitflags from 1.1.0 to 1.2.0

Bumps [bitflags](https://github.com/bitflags/bitflags) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bitflags/bitflags/compare/1.1.0...1.2.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
coreos/update-ssh-keys,coreos/update-ssh-keys