Bump metrics-server to 0.6.4

[bohrasd]

What this PR does / why we need it:

Bump metrics-server to 0.6.4

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Special notes for your reviewer:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bohrasd (23f3f81)

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[k8s-ci-robot]

Hi @bohrasd. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

Thanks @bohrasd!
/lgtm
/approve

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