build(deps-dev): update flake8-functions requirement

Updates the requirements on [flake8-functions](https://github.com/best-doctor/flake8-functions) to permit the latest version.
- [Release notes](https://github.com/best-doctor/flake8-functions/releases)
- [Commits](best-doctor/flake8-functions@v0.0.7...v0.0.8)

---
updated-dependencies:
- dependency-name: flake8-functions
  dependency-version: 0.0.8
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -40,7 +40,7 @@ flake8-eradicate = "^1.4.0"
 flake8-executable = "^2.1.2"
 flake8-expression-complexity = "^0.0.11"
 flake8-fixme = "^1.1.1"
-flake8-functions = "^0.0.7"
+flake8-functions = "^0.0.8"
 flake8-markdown = "^0.4.0"
 flake8-mutable = "^1.2.0"
 flake8-no-implicit-concat = "^0.3.4"