Update deprecated `containerd` registry mirror config

**What would you like to be added**:
In [release `v1.5.0`](https://github.com/containerd/containerd/releases/tag/v1.5.0), `containerd` deprecated the configuration for registry mirror we are currently using. The new way to configure registry mirrors can be found [here](https://github.com/containerd/containerd/blob/main/docs/hosts.md#setup-a-local-mirror-for-docker)

**Why is this needed**:
Avoid using deprecated configuration and ability to freely upgrade `containerd`. However, it seems like there are no plans for removal as of now so this is not a pressing issue.

Start by reading the linked containerd hosts.md guidance for local registry mirrors, then locate the current registry mirror configuration in the repository. Replace the deprecated configuration with the documented approach and verify that containerd upgrades remain supported; the issue does not name a specific file or test.

Written by the indexing model from the issue text.