chore(deps): update flake8 requirement from <6.0,>=5.0.4 to >=5.0.4,<…

…8.0 (#48)

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@5.0.4...7.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
...

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

requirements/test.txt

@@ -2,7 +2,7 @@
 
 black ==22.3.0
 isort >=5.10.1, <6.0
-flake8 >=5.0.4, <6.0
+flake8 >=5.0.4, <8.0
 pytest
 pytest-cov
 pytest-click