chore(gha): bump actions/setup-node from 4 to 6

Author: tbouffard

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

@@ -12,7 +12,7 @@ runs:
   using: 'composite'
   steps:
     - name: Setup node
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version-file: '.nvmrc'
         registry-url: ${{ inputs.registry-url }}