build(deps-dev): bump flake8-builtins from 2.0.1 to 2.1.0 (#322)

Bumps [flake8-builtins](https://github.com/gforcada/flake8-builtins) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/gforcada/flake8-builtins/releases)
- [Changelog](https://github.com/gforcada/flake8-builtins/blob/master/CHANGES.rst)
- [Commits](gforcada/flake8-builtins@2.0.1...2.1.0)

---
updated-dependencies:
- dependency-name: flake8-builtins
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>