chore(deps): bump peaceiris/actions-mdbook from 1 to 2 in the all group (#2706)

Bumps the all group with 1 update: [peaceiris/actions-mdbook](https://github.com/peaceiris/actions-mdbook).


Updates `peaceiris/actions-mdbook` from 1 to 2
- [Release notes](https://github.com/peaceiris/actions-mdbook/releases)
- [Changelog](https://github.com/peaceiris/actions-mdbook/blob/main/CHANGELOG.md)
- [Commits](https://github.com/peaceiris/actions-mdbook/compare/v1...v2)

---
updated-dependencies:
- dependency-name: peaceiris/actions-mdbook
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/kanidm_individual_book.yml

@@ -38,7 +38,7 @@ jobs:
             libudev-dev \
             libpam0g-dev
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
         with:
           mdbook-version: "latest"