Update devDependencies

[julien-deramond]

This PR partially supersedes #41382.

• Updates to rollup and stylelint will be handled separately, as a Dependabot PR for them existed prior to the Astro migration merge.
• The image-size upgrade will also be addressed in a separate PR due to a related build issue.

I ran npm run docs on both the main branch and this branch, compared all the generated HTML files (after running Prettier), and the only differences are (for all files):

diff --color=auto -r _site/docs/versions/index.html _site.dependabot/docs/versions/index.html
14c14
<     <meta name="generator" content="Astro v5.6.1" />
---
>     <meta name="generator" content="Astro v5.7.0" />

So the generated HTML files are the same.