Bump dockerflow from 2020.10.0 to 2021.7.0 (#418)
Bump dockerflow from 2020.10.0 to 2021.7.0 (#418)

Bumps [dockerflow](https://github.com/mozilla-services/python-dockerflow) from 2020.10.0 to 2021.7.0.
- [Release notes](https://github.com/mozilla-services/python-dockerflow/releases)
- [Changelog](https://github.com/mozilla-services/python-dockerflow/blob/main/docs/changelog.rst)
- [Commits](https://github.com/mozilla-services/python-dockerflow/compare/2020.10.0...2021.7.0)

---
updated-dependencies:
- dependency-name: dockerflow
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Kinto/kinto-attachment