Use TLS 1.2 in VPA Admission Webhook

[a-hilaly]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Use TLS 1.2 in VPA Admission Webhook

Which issue(s) this PR fixes:

#5712

Special notes for your reviewer:

Does this PR introduce a user-facing change?

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

[k8s-ci-robot]

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[mwielgus]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: A-Hilaly, mwielgus

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