ruby: bump version

[plowsof]

closes #2317

https://endoflife.date/ruby

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[nahuhh]

Debian 12 is using 3.1, so ubuntu LTS 24.04 likely will be too

[plowsof]

changes:

• netflify previews will mirror the ruby version on the getmonero server 3.0.2
• 3.1.0 (default in debian 12 bookworm now used in gh workflows

[plowsof]

3.0 was EOL'd 2 months ago https://endoflife.date/ruby

3.1's support ends in 8 months

Since Ruby 2.1, a new major version of Ruby has been released every year on December 25th, and EOLed 3 years, 3 months later.

to fix 3.2.4 errors:

• bundle version update to latest 2.5.14 https://rubygems.org/gems/bundler/versions

• exists? will have to be exist? lol https://stackoverflow.com/a/75353113

• build error for "tainted?" [Bug]:  jekyll/jekyll#9233 requires a bundle update jekyll liquid -> the resulting gem version updates in Gemfile

• problem: what 3.x (if any) ruby versions does netflify support provide ruby 3.0.0 support netlify/build-image#517 (comment)

[plowsof]

• moving jekyll-multiple-languages plugin (v1.8.0) to local so we can modify it
• fix the small issues causing errors on ruby versions >3.2.0
• we should update getmonero to the latest stable 3.3.4 (2~ years of support)

the 1st commit adding the local plugin should have the same sha256 as what exist on master

we can kick the can a little further down the road now and remain on jekyll.