Bump debian from bookworm-20251020 to bookworm-20251208 in /images/kubekins-e2e-v2

[dependabot]

Bumps debian from bookworm-20251020 to bookworm-20251208.

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[k8s-ci-robot]

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[cpanato]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[BenTheElder]

This doesn't seem helpful to merge constantly, this is just going to add more noise when we have to debug a broken build, this commit is ~opaque.

We already update packages anyhow.

x-ref discussion in #35799

cc @upodroid @kubernetes/sig-testing-leads

[BenTheElder]

#36068