Bump flake8 from 5.0.4 to 6.0.0 in /requirements (#910)

* Bump flake8 from 5.0.4 to 6.0.0 in /requirements

Bumps [flake8](https://github.com/pycqa/flake8) from 5.0.4 to 6.0.0.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@5.0.4...6.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Bump max version

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

requirements/style.txt

@@ -1,6 +1,6 @@
 # style
 black[jupyter]==22.10.0
-flake8==5.0.4
+flake8==6.0.0
 isort[colors]==5.10.1
 pydocstyle[toml]==6.1.1
 pyupgrade==3.2.2

setup.cfg

@@ -113,7 +113,7 @@ style =
     black[jupyter]>=21.8,<23
     # flake8 3.8+ depends on pyflakes 2.2+, which fixes a bug with mypy error code ignores:
     # https://github.com/PyCQA/pyflakes/pull/455
-    flake8>=3.8,<6
+    flake8>=3.8,<7
     # isort 5.8+ required for extend_skip option
     isort[colors]>=5.8,<6
     # pydocstyle 6.1+ required for pyproject.toml support