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](actions/setup-node@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/site.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Setup sbt
       uses: sbt/setup-sbt@v1
     - name: Setup NodeJs
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v6
       with:
         node-version: 16.x
         registry-url: https://registry.npmjs.org