Update Ruby and support Rails v8

[mateuszgorniak]

This PR introduces several updates and improvements:

• Ruby version upgrade

  • Updates the Ruby version used in the project to the latest release, 3.3.6.

• Rails v8 compatibility

  • Adjusts dependency constraints to support Ruby on Rails (RoR) version 8.
  • Updates the test project and modifies the generator to use the appropriate migration version for compatibility with Rails v8.

• Rubocop and Reek configuration update

  • Adapts config of both mentioned tools and regenerates the rubocop_todo.yml file to reflect the latest code analysis and align with updated coding standards.

• Documentation update

  • Adds a short guide how to work with gem - Running Tests Locally section

[mateuszgorniak]

@skcc321 could you check it next days? 🙇

[skcc321]

Great job @mateuszgorniak!
Could you please take a look at the CI results? I'll get it merged as soon as CI is green.

[mateuszgorniak]

Could we try to run workflows again @skcc321 ? :-)

[mateuszgorniak]

Ok, it seems the failing checks are related to an issue caused by the latest update of the logger gem – some details here. I’ve downgraded it for the time being and added a note to ensure we remember to update it again if the issue is resolved in TruffleRuby 😄