Bump peaceiris/actions-mdbook from 1 to 2 (#2244)

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

.github/workflows/gh-pages-mdbook.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: extractions/setup-just@v2
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
       - name: Install Dependencies
         shell: bash
         run: sudo apt-get install -y libwayland-dev libxkbcommon-dev # Required for winit