Bump flake8 from 4.0.1 to 6.0.0

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 6.0.0.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@4.0.1...6.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements-dev.txt

@@ -24,7 +24,7 @@ docutils==0.18.1
     # via readme-renderer
 filelock==3.6.0
     # via virtualenv
-flake8==4.0.1
+flake8==6.0.0
     # via -r requirements-dev.in
 identify==2.4.12
     # via pre-commit
@@ -48,7 +48,7 @@ marshmallow==2.21.0
     #   marshmallow-sqlalchemy
 marshmallow-sqlalchemy==0.23.1
     # via -r requirements-dev.in
-mccabe==0.6.1
+mccabe==0.7.0
     # via flake8
 nodeenv==1.7.0
     # via
@@ -62,11 +62,11 @@ platformdirs==2.5.1
     # via virtualenv
 pre-commit==3.0.4
     # via -r requirements-dev.in
-pycodestyle==2.8.0
+pycodestyle==2.10.0
     # via flake8
 pycparser==2.21
     # via cffi
-pyflakes==2.4.0
+pyflakes==3.0.1
     # via flake8
 pygments==2.11.2
     # via