Update GitHub Actions workflow to reintroduce Node.js setup step

- Added the Node.js setup step back into the documentation deployment workflow for consistency.
- Ensured caching for pnpm is maintained to optimize dependency installation.

Author: 0xfurai

.github/workflows/deploy-docs.yml

@@ -26,16 +26,16 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 20
-          cache: 'pnpm'
-
       - name: Setup pnpm
         uses: pnpm/action-setup@v3
         with:
           version: 9.0.0
 
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+
       - name: Install dependencies
         run: pnpm install --frozen-lockfile