Bump actions/setup-node from 4 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/npm-test-unit.yml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: "Use Node.js"
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20.x'
 

.github/workflows/playwright.yml

@@ -102,7 +102,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: "Setup node"
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20.x'