Upgrade Ruby from 3.3.10 to 4.0.1

[yagosansz]

What github issue is this PR for, if any?

Resolves #6750

What changed, and why?

We're upgrading Ruby from 3.3.10 to 4.01.

How is this tested? (please write rspec and jest tests!) 💖💪

Note: if you see a flake in your test build in github actions, please post in slack #casa "Flaky test: " :) 💪
Note: We love capybara tests! If you are writing both haml/js and ruby, please try to test your work with tests at every level including system tests like https://github.com/rubyforgood/casa/tree/main/spec/system

I went through the app pages for the users below and did a smoke test through some of the menu options:

• Login as a regular user at http://localhost:3000/users/sign_in.
  • volunteer1@example.com view site as a volunteer
  • supervisor1@example.com view site as a supervisor
  • casa_admin1@example.com view site as an admin
  • casa_admin2-1@example.com view site as admin from a different org
• Login as an all CASA admin at http://localhost:3000/all_casa_admins/sign_in.
  • allcasaadmin@example.com view site as an all CASA admin

Screenshots please :)

Run your local server and take a screenshot of your work! Try to include the URL of the page as well as the contents of the page.

Feelings gif (optional)

_What gif best describes your feeling working on this issue? https://giphy.com/

[yagosansz]

Hey folks, this is my first time completing a Ruby upgrade, if there are more things you need me to look at and test please let me know 🙏

I'll do a second pass at this and so more research on things to look out for!

[compwron]

https://devcenter.heroku.com/articles/ruby-support-reference#ruby-version-support-policy

[compwron]

Sorry we didn't put this in the ticket but I think that the safest thing is - Please update ruby to 4.0.2 and rubygems to 4.0.6 as per heroku currently supported docs https://devcenter.heroku.com/articles/ruby-support-reference#ruby-version-support-policy

[yagosansz]

Hi @compwron I'm closing this PR because the branch name is not meaningful. I created this new one: #6805