chore(deps): update peaceiris/actions-mdbook action to v2

Author: renovate[bot]

.github/workflows/book-cd.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup mdbook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
       - run: mdbook build docs
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3

.github/workflows/book-ci.yml

@@ -17,15 +17,15 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
       - run: mdbook build docs
 
   doc-test:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
       - run: mdbook test docs
 
   markdown-lint: