ci: bump actions/setup-node from 3 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 3 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v3...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/auto-deploy.yml

@@ -51,7 +51,7 @@ jobs:
         uses: actions/checkout@v4
       
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ env.NODE_VERSION }}
           cache: 'npm'

.github/workflows/deploy.yml

@@ -26,7 +26,7 @@ jobs:
           echo "✅ Brand compliance check passed"
 
       - name: Setup Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: '18'
 

.github/workflows/self-healing.yml

@@ -69,7 +69,7 @@ jobs:
       
       - name: Setup Node
         if: hashFiles('package.json') != ''
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'