Bump the test group with 3 updates (#627)

Bumps the test group with 3 updates: [pytest](https://github.com/pytest-dev/pytest), [tox](https://github.com/tox-dev/tox) and [flake8](https://github.com/pycqa/flake8).


Updates `pytest` from 7.4.3 to 7.4.4
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.3...7.4.4)

Updates `tox` from 4.11.4 to 4.12.0
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst)
- [Commits](tox-dev/tox@4.11.4...4.12.0)

Updates `flake8` from 6.1.0 to 7.0.0
- [Commits](PyCQA/flake8@6.1.0...7.0.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: test
- dependency-name: tox
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: test
...

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

requirements.txt

@@ -14,7 +14,7 @@ beautifulsoup4==4.12.2
 Pillow==10.2.0
 
 # Test requirements. It's not worth the hassle to keep them separate.
-pytest==7.4.3
+pytest==7.4.4
 pytest-cov==4.1.0
-tox==4.11.4
-flake8==6.1.0
+tox==4.12.0
+flake8==7.0.0