Remove old py versions

[cdorsman]

• Github Actions was checking with latest version of Python , which is 3.13. I changed this to Python 3.12
• Removed old versions (2, 2.7, 3.6, 3.7, 3.8) in the following files
  python-patterns/blob/master/setup.cfg
  python-patterns/blob/master/setup.py
  python-patterns/blob/master/.travis.yml
  python-patterns/blob/master/lint.sh
  python-patterns/blob/master/tox.ini

The errors from the workflow are now caused by genuine formatting bugs and missing types

[faif]

The changes look good. Do you know why the linter fails?

[cdorsman]

@faif Mainly because several linters founded errors in the code-base.

Unfortunately the setup of the GitHub Actions workflow with an embedded script with a wide variety of linters is not really effective, because you are not able to see which linter is failing and the reason behind it.

From a user perspective, it is not user friendly as well, because lint.sh just installs the packages system-wide instead in a virtualenv.

In my humble opinion. It
would be more effective, if the pipeline/workflow would be adjusted to execute a linter step by step.

This will improve the efficiency greatly.

[cdorsman]

I have added a adjusted lint_python workflow where all the linters are executed but per step.

You now see what and why a linter fails. For now, I added the option to continue on error, so that there is room to fix all the problems.

[cdorsman]

I also added a workflow that lints per PR and Pull and not everything (which is a lot)

You can decide what you want with it.