ci: 👷 Update GitHub Actions to Node.js 24

[smfonseca]

User Story

As a maintainer of SDS, I want to update all GitHub Actions in our repositories that still rely on Node.js 20,
so that our workflows remain fully functional and secure once GitHub Actions transitions to Node.js 24 by June 2nd, 2026.

Affected repositories:

• solid
• communications
• showcase

Example:

Suggested Solution

Any actions currently running on Node.js 20 (e.g., actions/checkout@v4) are updated to versions that support Node.js 24.

DoR

• Item has business value
• Item has been estimated by the team
• Item is clear and well-defined
• Item dependencies have been identified