Update to Jekyll 4.3.1

[breun]

• https://github.com/jekyll/jekyll/releases/tag/v4.3.0
• https://github.com/jekyll/jekyll/releases/tag/v4.3.1

Jekyll 4.3.0 added webrick as a dependency, so this update should also fix #335.

[pathofleastresistor]

Have you been able to test this? I created an issue because I don't think you can use an Alpine base image for 4.3

#353

[breun]

I haven't tested this, because I can't run the pipeline.

[JV-conseil]

Hi 👋

While waiting for @envygeeks to update this repo, I've pushed to Docker Hub an updated version for jekyll/builder image:
https://hub.docker.com/r/jvconseil/jekyll-docker

See also PR #369

Best,
@JV-conseil