chore(deps): update actions/setup-node action to v6 (#102)

Author: renovate[bot]

.github/workflows/external.yml

@@ -63,7 +63,7 @@ jobs:
         working-directory: ./project
 
       - name: Use Node.js ${{ matrix.node_version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node_version }}