chore: Adding mcr.microsoft.com/oss/kubernetes/pause:3.4.1 to Windows VHD

[marosset]

mcr.microsoft.com/oss/kubernetes/pause:3.4.1 has support for Windows Server Ver 20H2

Reason for Change:

Issue Fixed:

Credit Where Due:

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

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

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

Notes:

[marosset]

I'll update the default version used by aks-engine after a VHD with v3.4.1 is published and also used as the default windows VHD

[codecov]

Codecov Report

Merging #4331 (de47b57) into master (2f854cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4331   +/-   ##
=======================================
  Coverage   72.06%   72.06%           
=======================================
  Files         141      141           
  Lines       21634    21634           
=======================================
  Hits        15590    15590           
  Misses       5093     5093           
  Partials      951      951           

---

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[jsturtevant]

/lgtm

/cc @AbelHu @mainred

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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