⬆️ Update BookStackApp/BookStack to v23.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
BookStackApp/BookStack	patch	v23.12 -> v23.12.1

---

Release Notes

BookStackApp/BookStack (BookStackApp/BookStack)

### [`v23.12.1`](https://togithub.com/BookStackApp/BookStack/releases/tag/v23.12.1): BookStack v23.12.1 [Compare Source](https://togithub.com/BookStackApp/BookStack/compare/v23.12...v23.12.1) ##### Links - [Update instructions](https://www.bookstackapp.com/docs/admin/updates) ##### Full List of Changes This release contains the following fixes and changes: - Fixed chapter API missing expected "book_slug" field. ([#​4765](https://togithub.com/BookStackApp/BookStack/issues/4765)) - Updated translations with latest Crowdin changes. ([#​4747](https://togithub.com/BookStackApp/BookStack/pull/4747))

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ 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 this update again.

---

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

---

This PR has been generated by Mend Renovate. View repository job log here.