Ruby 3 support

[brockfanning]

This small code change seems to support the latest version of Ruby (3.2). To test this out with Ruby 3.2, you would need to point to this branch of jekyll-open-sdg-plugins in your Gemfile, such as:

gem 'jekyll-open-sdg-plugins', git: 'https://github.com/open-sdg/jekyll-open-sdg-plugins.git', branch: 'ruby-3-support'

And you would also need to adjust all of your Github Actions workflow files (eg, .github/workflows/test-pull-requests.yml, and all of the others in that folder) to use Ruby 3, such as:

    - name: Set up Ruby 3.2
      uses: ruby/setup-ruby@v1
      with:
        ruby-version: '3.2'

[sarah-beasley]

Hi @brockfanning, this isn't working for me when I'm trying to make these changes. Here is the error that keeps coming up - https://github.com/ONSdigital/sdg-indicators/actions/runs/4993296549/jobs/8942200832?pr=3731. I've made a PR so you can check the files i've changed here.

[brockfanning]

@sarah-beasley Thanks for testing. Can you also add these lines to your Gemfile:

gem "kramdown-parser-gfm"
gem "webrick"

[sarah-beasley]

@brockfanning just added those lines and it errored very quickly - https://github.com/ONSdigital/sdg-indicators/actions/runs/5002864894/jobs/8963355031 , perhaps we need to specify the version of kramdown?

[brockfanning]

@sarah-beasley Ah, I think we also need to specify the version of Jekyll. Can you try changing the Gemfile line about Jekyll to this?

gem "jekyll", "3.9.3"

[sarah-beasley]

thanks @brockfanning that seems to have worked! fb here if you're interested

[sarah-beasley]

this worked when testing on UK site when additional lines of code were included in the gemfile