Update doc server to ruby 3

[stefandecimelli]

Description

Updates the ruby version for the doc server in order to fix dependency issue.
(pull request recreated for proper commit signing)

Addressed Issue

fixes: #4247

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[nscuro]

Do we know if this will work with GitHub Pages? They still list Jekyll v3.x here: https://pages.github.com/versions/

It seems like in order to use newer versions of Jekyll, you need to build and publish the site via GitHub Actions: https://www.moncefbelyamani.com/making-github-pages-work-with-latest-jekyll/

[stefandecimelli]

Do we know if this will work with GitHub Pages? They still list Jekyll v3.x here: https://pages.github.com/versions/

It seems like in order to use newer versions of Jekyll, you need to build and publish the site via GitHub Actions: https://www.moncefbelyamani.com/making-github-pages-work-with-latest-jekyll/

It seems we are at a bit of an impasse here.
The highest 3.x tag for jekyll is 3.8 / 3.8.6, which still uses Ruby 2. (https://hub.docker.com/r/jekyll/jekyll/tags).

The next subsequent version tag is 4.x with only 4.2.2 using Ruby 3, which Github has not added support for according to their version doc.

According to this comment the maintainer for the jekyll docker images is no longer active.

This PR will need to wait until GitHub updates their supported Jekyll version to 4.2.2.