Bump flake8 from 3.8.0 to 6.1.0

Bumps [flake8](https://github.com/pycqa/flake8) from 3.8.0 to 6.1.0.
- [Commits](PyCQA/flake8@3.8.0...6.1.0)

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

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

requirements-dev.txt

@@ -25,7 +25,7 @@ docopt==0.6.2
     # via coveralls
 exceptiongroup==1.1.3
     # via pytest
-flake8==3.8.0
+flake8==6.1.0
     # via -r requirements-dev.in
 flask==2.2.5
     # via -r requirements-dev.in
@@ -43,7 +43,7 @@ markupsafe==2.1.2
     # via
     #   jinja2
     #   werkzeug
-mccabe==0.6.1
+mccabe==0.7.0
     # via flake8
 mock==5.1.0
     # via -r requirements-dev.in
@@ -55,9 +55,9 @@ packaging==20.9
     # via pytest
 pluggy==0.13.1
     # via pytest
-pycodestyle==2.6.0
+pycodestyle==2.11.1
     # via flake8
-pyflakes==2.2.0
+pyflakes==3.1.0
     # via flake8
 pyparsing==2.4.7
     # via packaging