chore(deps): 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/build.yml

@@ -57,7 +57,7 @@ jobs:
       - name: Export Zephyr CMake package (west zephyr-export)
         run: west zephyr-export
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "14.x"
       - name: Install @actions/artifact
@@ -191,7 +191,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "14.x"
       - name: Install js-yaml
@@ -220,7 +220,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "14.x"
       - name: Install js-yaml
@@ -349,7 +349,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "14.x"
       - name: Install js-yaml