Change k8s example to use ingress v1

[jacobgreenleaf]

In Kubernetes 1.22, the v1beta1 version of Ingress
is no longer available, thus the example fails to create
the ingress on Kubernetes >= 1.22 with the following error:

╷
│ Error: Failed to create Ingress 'test/test-ingress' because: the server could not find the requested resource (post ingresses.extensions)
│ 
│   with module.kubernetes-config.kubernetes_ingress.test_ingress,
│   on kubernetes-config/main.tf line 126, in resource "kubernetes_ingress" "test_ingress":
│  126: resource "kubernetes_ingress" "test_ingress" {
│ 

Instead, switch the example to use kubernetes_ingress_v1.

Note that this now increases the minimum version of
terraform-provider-kubernetes since kubernetes_ingress_v1 was
added in v2.7.0.

[andrewsomething]

👍 LGTM, thanks @jacobgreenleaf!

[MattIPv4]

Hey, @jacobgreenleaf - Thanks a ton for this sweet PR! 😄

Would you please shoot me an email when you get a chance?
mcowley at digitalocean dot com 🎉