fix(ci): Update the referenced versions of the action steps

Author: schnaitter

.github/workflows/deploy-book.yml

@@ -16,10 +16,10 @@ jobs:
       pages: write
       id-token: write
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version-file: '.python-version'
         cache: pip
@@ -44,11 +44,11 @@ jobs:
         jupyter-book build .
 
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-pages-artifact@v4
       with:
         path: "_build/html"
 
     - name: Deploy to GitHub Pages
       id: deployment
-      uses: actions/deploy-pages@v4
+      uses: actions/deploy-pages@v5