chore(deps): update actions/setup-node action to v6

Beachball-bump-type: patch

Author: renovate[bot]

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
 
       # Install dependencies (example using pnpm)
       - uses: pnpm/action-setup@v4
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: pnpm