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

Author: renovate[bot]

.github/actions/setup-pnpm/action.yml

@@ -16,7 +16,7 @@ runs:
         run_install: false
 
     - name: Setup Node.js and pnpm
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: 22.18.0
         cache: 'pnpm'