ci: bump actions/setup-node from 5 to 6 in /.github/actions/setup (#714)

Author: dependabot[bot]

.github/actions/setup/action.yaml

@@ -9,7 +9,7 @@ runs:
   using: "composite"
   steps:
     - name: Use Node.js ${{ inputs.node-version }}
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         registry-url: "https://registry.npmjs.org"
         node-version: ${{ inputs.node-version }}