Bump cffi from 1.15.0 to 1.15.1 (#529)
Bump cffi from 1.15.0 to 1.15.1 (#529)

Bumps [cffi](http://cffi.readthedocs.org) from 1.15.0 to 1.15.1.

---
updated-dependencies:
- dependency-name: cffi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Kinto/kinto-attachment