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

Author: renovate[bot]

.github/workflows/check-formatting.yaml

@@ -27,7 +27,7 @@ jobs:
           version: ${{ steps.pnpm-version.outputs.pnpm_version }}
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: '.nvmrc'
           cache: 'pnpm'