Update autoflake requirement from ~=1.4 to ~=1.5
Updates the requirements on [autoflake](https://github.com/PyCQA/autoflake) to permit the latest version.
- [Release notes](https://github.com/PyCQA/autoflake/releases)
- [Commits](https://github.com/PyCQA/autoflake/compare/v1.4...v1.5.1)
---
updated-dependencies:
- dependency-name: autoflake
dependency-type: direct:development
...
Signed-off-by: dependabot[bot] <support@github.com>