Jekyll image: Fix build failures to github-pages

[Mathiyarasy]

Fix: https://github.com/devcontainers/images/actions/runs/13118951176/job/36600100452

ERROR: process "/bin/sh -c gem install bundler jekyll github-pages" did not complete successfully: exit code: 1
RUN gem install bundler jekyll github-pages:
19.13 Successfully installed rouge-3.30.0
19.13 Building native extensions. This could take a while...
20.00 ERROR:  Error installing github-pages:
20.00 	"sass" from sass conflicts with installed executable from sass-embedded

Installing github-pages in jekyll images started throwing issues

[Mathiyarasy]

Opened: https://github.com/jekyll/jekyll-sass-converter/issues/172 Workaround: https://github.com/devcontainers/images/pull/1298