update GitHub Actions workflow to use latest action versions for caching and deployment

Author: lxsaah

.github/workflows/docs.yml

@@ -25,7 +25,7 @@ jobs:
       uses: dtolnay/rust-toolchain@stable
 
     - name: Cache dependencies
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.cargo/registry
@@ -38,15 +38,15 @@ jobs:
 
     - name: Setup Pages
       if: github.ref == 'refs/heads/main'
-      uses: actions/configure-pages@v3
+      uses: actions/configure-pages@v4
 
     - name: Upload artifact
       if: github.ref == 'refs/heads/main'
-      uses: actions/upload-pages-artifact@v2
+      uses: actions/upload-pages-artifact@v3
       with:
         path: ./target/doc
 
     - name: Deploy to GitHub Pages
       if: github.ref == 'refs/heads/main'
       id: deployment
-      uses: actions/deploy-pages@v2
+      uses: actions/deploy-pages@v4