fix: deprecated import of cacheddiscovery in balancer

[gsixo]

What type of PR is this?

/kind cleanup
/kind deprecation

What this PR does / why we need it:

Fixes deprecated imports of legacy NewMemCacheClient() from cacheddiscovery "k8s.io/client-go/discovery/cached" to cacheddiscovery "k8s.io/client-go/discovery/cached/memory"

Which issue(s) this PR fixes:

Fixes NewMemCacheClient() import
in k8s.io/client-go/discovery/cached - NewMemCacheClient is DEPRECATED. Use memory.NewMemCacheClient directly.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

- [Usage]: https://pkg.go.dev/k8s.io/client-go/discovery/cached
- [Usage]: https://pkg.go.dev/k8s.io/client-go/discovery/cached/memory

[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label and removing any existing "release-note-none" label because there is a "kind/deprecation" label on the PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gsixo
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[k8s-ci-robot]

Hi @gsixo. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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