ci: update GitHub Action versions

Most of them are stale, and at least one of them doesn't work any longer.

Author: sjbarag

.github/workflows/pages.yaml

@@ -32,17 +32,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v3
-      - uses: pnpm/action-setup@v2
+        uses: actions/configure-pages@v5
+      - uses: pnpm/action-setup@v4
         with:
           version: 8.7.5
       - name: Setup Node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: "22"
           cache: pnpm
           cache-dependency-path: ${{ env.BUILD_PATH }}/pnpm-lock.yaml
       - name: Install dependencies
@@ -52,7 +52,7 @@ jobs:
         run: pnpm run build
         working-directory: ${{ env.BUILD_PATH }}
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ${{ env.BUILD_PATH }}/_site
 
@@ -66,4 +66,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4