chore: update cluster-autoscaler to v1.19.1

[mboersma]

Reason for Change:

See https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.19.1

Issue Fixed:

Azure-specific fixes included:

• Improvements for VMSS VM API calls and backoff configurations.
• Add stable labels for os and arch.

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3996 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3996      +/-   ##
==========================================
- Coverage   73.83%   73.68%   -0.16%     
==========================================
  Files         147      147              
  Lines       23161    23161              
==========================================
- Hits        17102    17067      -35     
- Misses       4942     4979      +37     
+ Partials     1117     1115       -2     

Impacted Files	Coverage Δ
pkg/api/k8s_versions.go	100.00% <ø> (ø)
cmd/root.go	57.52% <0.00%> (-12.37%)	⬇️
cmd/get_skus.go	46.51% <0.00%> (-11.63%)	⬇️
cmd/get_locations.go	86.57% <0.00%> (-1.35%)	⬇️

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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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