Update Netlify build to run `ubuntu-24.04`

[romaricpascal]

What

Update Netlify's build image to use ubuntu-20.04 as well.

Why

To upgrade from the deprecated Ubuntu 20.04 environment on Netlify, and more generally to keep running on the most up to date environment.

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• Netlify builds use ubuntu-24.04 as well.