chore(deps): 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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 20
 
@@ -51,7 +51,7 @@ jobs:
           persist-credentials: false
           ref: ${{ github.head_ref }}
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.x
           registry-url: 'https://npm.pkg.github.com'
@@ -74,7 +74,7 @@ jobs:
           NODE_AUTH_TOKEN: ${{ secrets.STAFFBOT_NPM_WRITE }}
           GITHUB_TOKEN: ${{ steps.get_token.outputs.token }}
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: steps.semantic.outputs.new_release_published == 'true'
         with:
           node-version: 20.x