Update actions/setup-node action to v6

| datasource  | package            | from | to |
| ----------- | ------------------ | ---- | -- |
| github-tags | actions/setup-node | v5   | v6 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/run-tests.yml

@@ -45,7 +45,7 @@ jobs:
 
       # NPM part (test whether assets can be compiled)
       - name: Setup Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 22