update node image to latest

[BenTheElder]

see: #1797 (comment)

[k8s-ci-robot]

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[BenTheElder]

note: we are not rolling forward the default kubernetes version yet due to upstream startup time regression.

TODO: probably in 1.21 after other things settle down we'll start tracking this in CI.

[k8s-ci-robot]

@BenTheElder: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kind-e2e-kubernetes-1-19	00a2d97	link	/test pull-kind-e2e-kubernetes-1-19

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[BenTheElder]

tested locally with rootful docker on linux.
flake above is unrelated.
unblocking rootless CI

$ time kind create cluster
Creating cluster "kind" ...
 ✓ Ensuring node image (kindest/node:v1.20.2) 🖼 
 ✓ Preparing nodes 📦  
 ✓ Writing configuration 📜 
 ✓ Starting control-plane 🕹️ 
 ✓ Installing CNI 🔌 
 ✓ Installing StorageClass 💾 
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Have a question, bug, or feature request? Let us know! https://kind.sigs.k8s.io/#community 🙂

real	0m32.501s
user	0m1.790s
sys	0m1.028s

(note: image was already on the machine, so no image pull time)