chore(deps): bump themes/hugo-book from 3f1bccc to 2dffe0b

Bumps [themes/hugo-book](https://github.com/alex-shpak/hugo-book) from `3f1bccc` to `2dffe0b`.
- [Release notes](https://github.com/alex-shpak/hugo-book/releases)
- [Commits](alex-shpak/hugo-book@3f1bccc...2dffe0b)

---
updated-dependencies:
- dependency-name: themes/hugo-book
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>