Update Hugo build workflow to Node.js 22 (review comment r3505939990)

[Copilot]

The PR addresses a single review comment requesting removal of an EOL Node.js runtime from CI. The Hugo build workflow now uses a supported LTS major version.

• Scope

  • Applies only the linked review suggestion in .github/workflows/hugo-build.yaml.
  • No functional or structural workflow changes beyond Node runtime version.

• Change

  • Updated actions/setup-node input from 20.10.0 to 22.

- name: Setup Node
  uses: actions/setup-node@v6
  with:
    node-version: 22

[Copilot]

Pull request overview

Updates the GitHub Actions Hugo build workflow to use a supported Node.js major version by switching actions/setup-node from a pinned Node 20 patch to Node 22. This keeps the CI workflow aligned with supported runtimes without changing the workflow structure or behavior beyond the Node version selected.

Changes:

• Updated actions/setup-node@v6 node-version from 20.10.0 to 22 in the Hugo build workflow.

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