chore: update cluster-autoscaler to latest patch versions

[mboersma]

Reason for Change:

See https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.19.0
and https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.16.6
and https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.15.7

Issue Fixed:

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3683 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3683   +/-   ##
=======================================
  Coverage   73.14%   73.14%           
=======================================
  Files         147      147           
  Lines       25220    25220           
=======================================
  Hits        18448    18448           
  Misses       5638     5638           
  Partials     1134     1134           

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

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[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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