Bump moto[s3,server] from 3.1.8 to 3.1.9 (#511)
Bump moto[s3,server] from 3.1.8 to 3.1.9 (#511)

Bumps [moto[s3,server]](https://github.com/spulec/moto) from 3.1.8 to 3.1.9.
- [Release notes](https://github.com/spulec/moto/releases)
- [Changelog](https://github.com/spulec/moto/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spulec/moto/compare/3.1.8...3.1.9)

---
updated-dependencies:
- dependency-name: moto[s3,server]
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Kinto/kinto-attachment