Bump actions/setup-node from 5 to 6 (#1138)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/predeploy.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Checkout branch
       uses: actions/checkout@v5
     - name: Setup Node.js for use with actions
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: '20'
     - name: Set up Python 3.12

.github/workflows/test-website.yml

@@ -21,7 +21,7 @@ jobs:
         # Full git history is needed to get a proper list of changed files within `super-linter`
         fetch-depth: 0
     - name: Setup Node.js for use with actions
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version:  '20'
     - name: Set up Python 3.12