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

Author: renovate[bot]

.github/workflows/copilot-setup-steps.yml

@@ -38,7 +38,7 @@ jobs:
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Set up Node.js for mega-linter-runner
-        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
+        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
         with:
           node-version: "22"