Add Ruby 3.3 and Ruby next to matrix

[pirj]

🤔 What's changed?

Add the recently released Ruby 3.3 and Ruby next to matrix

⚡️ What's your motivation?

Some weird failures happen with ruby-head https://github.com/rspec/rspec-mocks/actions/runs/7659693178/job/20875374161?pr=1477

Apparently, bigdecimal now needs to be explicitly declared as a dependency in ruby-head

To check that, we need a ruby-head build.

🏷️ What kind of change is this?

• :support:

♻️ Anything particular you want feedback on?

📋 Checklist:

• [x] I agree to respect and uphold the Cucumber Community Code of Conduct

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[luke-hill]

I agree about not using ruby-head. I also agree there are some odd failures. Although head is essentially 3.4 and I know some gems are being altered by default with each new ruby.

It's something to add to "the list"

I think I also need to start getting 3.3 on the other CI systems

[pirj]

Please consider this PR just a demonstration of the issue with bigdecimal.

[luke-hill]

Thanks for the help. It is greatly appreciated. I'll get on this soon