Bump autoflake from 1.4 to 1.7.7 (#2430)

Bump autoflake from 1.4 to 1.7.7 (#2430)

Bumps [autoflake](https://github.com/PyCQA/autoflake) from 1.4 to 1.7.7.
- [Release notes](https://github.com/PyCQA/autoflake/releases)
- [Commits](https://github.com/PyCQA/autoflake/compare/v1.4...v1.7.7)

---
updated-dependencies:
- dependency-name: autoflake
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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