Update metallb range

[DanielArndt]

Description

Increases the address range for metallb as now the AMF and UPF both require an address.

This is a quick fix to get the tutorial working again. A re-organisation of this metallb information will follow putting it in a different section.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] I have added tests that validate the behaviour of the software
• [ ] I validated that new and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [ ] I have bumped the version of the library