feat(kubernetes): Update docs with k8s 1.31 support

[zeitlerc]

Update the supported Kube versions to match the latest Kubernetes agent release
newrelic/nri-kubernetes#1114

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[nbaenam]

Hi @zeitlerc, could you please sign the CLA by clicking the yellow button a few messages above this one? I'll be able to merge in as soon as you do. Thanks!

[zeitlerc]

I need to make some other changes before updating this so closing for now. I found outdated portions of the docs that need to be updated for newer versions of Kubernetes