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](actions/setup-node@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>

Author: dependabot[bot]

.github/workflows/branch-deploy.yml

@@ -80,7 +80,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm

.github/workflows/continuous-delivery.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm

.github/workflows/continuous-integration.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm

.github/workflows/pages.yml

@@ -41,7 +41,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm