🐛 fix(chart): switch from ingress annotation to ingressClassName

[reg0bs]

The annotation kubernetes.io/ingress.class: alb is deprecated based on an error I got when trying to deploy:

helm install unguard . --values values.yaml --wait --namespace unguard --create-namespace
W0122 08:02:46.163224 663632 warnings.go:70] annotation "kubernetes.io/ingress.class" is deprecated, please use 'spec.ingressClassName' instead

I've updated the specs accordingly so they include the supported ingressClassName.

[W3D3]

Thanks for the contribution!
The build seems to be failing for unrelated reasons, but we are already looking into fixing this - will let you know once it is ready to rebase!