upgrade setup-node action so it doesn't crash

Author: dtinth

.github/workflows/pulumi.yml

@@ -15,7 +15,7 @@ jobs:
       - name: pnpm
         uses: pnpm/action-setup@v4
       - name: node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: 18
           cache: pnpm