Workflows: Upgrade git workflow actions to v4 (node20)

[ivanslabbert]

See warnings in workflow runs

Do some research on how to migrate to V4 and discuss at the next Standup meeting

[belljohan3]

Reserachs ressources:

Links:

• https://github.com/actions/checkout
• https://github.com/actions/setup-node/tree/v4/