test: upgrade nerdctl to v2

[tao12345666333]

This release of nerdctl is expected to be used with containerd v1.6, v1.7, or v2.0.
https://github.com/containerd/nerdctl/releases/tag/v2.0.2

The nerdctl v2.x is also expected to be compatible with containerd v2.

This pull request includes updates to version numbers for dependencies in the nerdctl GitHub workflow and the default base image in the nodeimage package.

Version updates:

• .github/workflows/nerdctl.yaml: Updated NERDCTL_VERSION from "1.7.4" to "2.0.2".
  * pkg/build/nodeimage/defaults.go: Updated DefaultBaseImage from "docker.io/kindest/base:v20241212-9f82dd49" to "docker.io/kindest/base:v20250117-f528b021".

[tao12345666333]

The CI failure was due to using cat to read the configuration in this directory within the workflow. However, a default directory was added in v2.

I will fix it.

sudo tree  /etc/cni/net.d/
/etc/cni/net.d/
├── default
│   └── nerdctl-kind.conflist
└── nerdctl-bridge.conflist

2 directories, 2 files

[AkihiroSuda]

?

[tao12345666333]

I have explained here #3850 (comment) that the previous method would lead to errors.

failed job: https://github.com/kubernetes-sigs/kind/actions/runs/12855249247/job/35840567917

[BenTheElder]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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[BenTheElder]

/lgtm
thank you!