Use new api for Ingresses

[ClementGautier]

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] New Feature
• [x] Feature Improvment
• [ ] Refactoring
• [ ] Documentation
• [ ] Other, please describe:

Description: Fixes #29, Tested using kubeval:

helm template ./mlhub --set ingress.enabled=true | kubeval -v 1.22.4 -s  https://raw.githubusercontent.com/yannh/kubernetes-json-schema/master

(I also tried to enable every other flags to see if it was compatible to not miss something but it seems the ingress was the only object impacted by the deprecations).

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] My changes don't require a change to the documentation, or if they do, I've added all required information.

[raethlein]

Awesome, thank you very much @ClementGautier!