docs: update theme 1.9

[dgarcia360]

Motivation

Updates docs theme to 1.9.

Changelog: https://github.com/scylladb/sphinx-scylladb-theme/blob/master/docs/source/upgrade/CHANGELOG.md#190---26-february-2026

How to test

1. Make sure you are using Python 3.11-3.14:

   python --version
   

2. Install uv:

   make setupenv
   

3. Build the docs:

   make preview
   

4. Docs should render without errors at http://127.0.0.1:5500

[annastuchlik]

@dkropachev Please review.
I'm not sure what the failed security check does. From my perspective, the PR looks good.

[Lorak-mmk]

Thanks!

[Lorak-mmk]

Interesting that here contents: write is not present. I'm even more curious now about why PRs in other repos have it.

[annastuchlik]

I'll defer to @dgarcia360

[dgarcia360]

The docs-pr workflow doesn't need write permissions. It only builds the docs on new PRs for validation purposes.

The docs-pages workflow might need write permissions. Some repos (like this one) still use an older workflow that pushes to a github-pages branch, which requires contents: write. We propagated that permission from the theme repo, but it may not actually be necessary in repos using the newer GitHub Actions deploy workflow. I'll roll it back in those repos.

[Lorak-mmk]

@dkropachev I don't know what is this security/snyk (dkropachev) pipeline, and even though I am a maintainer I am unable to see the details of it and why it failed. Should I ignore this pipeline and merge PRs without passing CI?