deps(docs): update docusaurus monorepo to v3.9.1

[renovate]

Coming soon: The Renovate bot (GitHub App) will be renamed to Mend. PRs from Renovate will soon appear from 'Mend'. Learn more here.

This PR contains the following updates:

Package	Change	Age	Confidence
@docusaurus/core (source)	3.9.0 -> 3.9.1
@docusaurus/module-type-aliases (source)	3.9.0 -> 3.9.1
@docusaurus/preset-classic (source)	3.9.0 -> 3.9.1
@docusaurus/theme-mermaid (source)	3.9.0 -> 3.9.1
@docusaurus/types (source)	3.9.0 -> 3.9.1

---

Release Notes

facebook/docusaurus (@​docusaurus/core)

v3.9.1: 3.9.1

Compare Source

3.9.1 (2025-09-26)

🐛 Bug Fix

• docusaurus
  • #​11434 fix(core): fix Docusaurus outDir for sites using baseUrl (@​slorber)

Committers: 1

• Sébastien Lorber (@​slorber)

facebook/docusaurus (@​docusaurus/module-type-aliases)

v3.9.1

Compare Source

facebook/docusaurus (@​docusaurus/preset-classic)

v3.9.1

Compare Source

facebook/docusaurus (@​docusaurus/theme-mermaid)

v3.9.1

Compare Source

🐛 Bug Fix

• docusaurus
  • #​11434 fix(core): fix Docusaurus outDir for sites using baseUrl (@​slorber)

Committers: 1

• Sébastien Lorber (@​slorber)

---

Configuration

📅 Schedule: Branch creation - "after 9pm,before 6am" in timezone Europe/Zurich, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.