Update controller container image to v1.4.0.

[Gacko]

Closes https://github.com/giantswarm/giantswarm/issues/23642.

Tests on workload clusters (not always required)

For changes in the chart, chart templates, and ingress controller container images, I executed the following tests
to verify them working in live enviromnents:

Test / Provider	AWS	Azure	KVM
Upgrade from previous version	✅	✅
Existing Ingress resources are reconciled correctly	✅	✅
Fresh install	✅	✅
Fresh Ingress resources are reconciled correctly	✅	✅

Testing was done using hello-world-app.

Hint for KVM:

kubectl port-forward -n kube-system svc/nginx-ingress-controller-app 8080:80
ingress_domain=host.configured.in.ingress; curl --connect-to "$ingress_domain:80:127.0.0.1:8080" "http://$ingress_domain" -v

[ubergesundheit]

LGTM. Please also document what to do if 1.3.1 is skipped

[webwurst]

We should add kubeVersion: ">=1.23.0-0" to Chart.yaml according to https://github.com/kubernetes/ingress-nginx/tree/helm-chart-4.3.0#support-versions-table

And it would be good to mention changes in naming of metrics on the Changelog:

• Consistent prometheus metric names and documentation kubernetes/ingress-nginx#8728
• https://github.com/kubernetes/ingress-nginx/blob/main/docs/user-guide/monitoring.md#exposed-metrics

[Gacko]

Hm, ok. Will have a look at this tomorrow. I'll postpone the release of v2.19.0 for now. Already added a note about the migration to Lease API.