Update actions versions

Author: ehuss

.github/workflows/deploy.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Install mdbook
@@ -20,7 +20,7 @@ jobs:
       run: |
         ./generate-book.py
     - name: Upload Artifact
-      uses: actions/upload-pages-artifact@v1.0.8
+      uses: actions/upload-pages-artifact@v3.0.1
       with:
         path: ./book
 
@@ -38,4 +38,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - id: deployment
-        uses: actions/deploy-pages@v2.0.0
+        uses: actions/deploy-pages@v4.0.4