chore: rev Linux VHDs to 2020.09.14

[jackfrancis]

Reason for Change:

This PR updates the Linux VHDs to version 2020.09.14.

Issue Fixed:

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3827 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3827   +/-   ##
=======================================
  Coverage   73.20%   73.20%           
=======================================
  Files         148      148           
  Lines       25428    25428           
=======================================
  Hits        18614    18614           
  Misses       5679     5679           
  Partials     1135     1135           

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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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