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] <support@github.com>

Author: dependabot[bot]

.github/workflows/publish-vscode-extension.yml

@@ -28,7 +28,7 @@ jobs:
     name: Publish '${{ inputs.extension-name }}-${{ inputs.version }}-${{ inputs.postfix }}.vsix'
     steps:
       - name: Use Node.js 22.x
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: 22.x
       - name: Download Release VSIX