Bump cornice from 5.0.3 to 5.1.0
Bump cornice from 5.0.3 to 5.1.0

Bumps [cornice](https://github.com/mozilla-services/cornice) from 5.0.3 to 5.1.0.
- [Release notes](https://github.com/mozilla-services/cornice/releases)
- [Changelog](https://github.com/Cornices/cornice/blob/master/CHANGES.txt)
- [Commits](https://github.com/mozilla-services/cornice/compare/5.0.3...5.1.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Kinto/kinto-attachment