chore: bump actions/setup-node from 5 to 6 (#378)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/site.yaml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: ⚙️ Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20.x
           cache: npm

.github/workflows/site_deploy.yaml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: ⚙️ Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20.x
           cache: npm