chore: update metrics-server to v0.3.6

[jackfrancis]

Reason for Change:

This PR updates the metrics-server we install w/ the cluster to v0.3.6. See:

https://github.com/kubernetes-sigs/metrics-server/releases/tag/v0.3.6

Issue Fixed:

Fixes #3449

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

Merging #3463 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3463   +/-   ##
=======================================
  Coverage   73.16%   73.16%           
=======================================
  Files         147      147           
  Lines       25024    25024           
=======================================
  Hits        18310    18310           
  Misses       5580     5580           
  Partials     1134     1134           

Impacted Files	Coverage Δ
pkg/api/k8s_versions.go	100.00% <ø> (ø)

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[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma

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