chore: rev Linux VHDs to 2020.10.30

[jackfrancis]

Reason for Change:

This PR updates the Ubuntu 16.04 and 18.04 VHDs to the 2020.10.30 version.

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:

[codecov]

Codecov Report

Merging #4016 (7906aec) into master (d400c00) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4016   +/-   ##
=======================================
  Coverage   73.69%   73.69%           
=======================================
  Files         147      147           
  Lines       23164    23164           
=======================================
  Hits        17070    17070           
  Misses       4979     4979           
  Partials     1115     1115           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d400c00...7906aec. Read the comment docs.

[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [jackfrancis,mboersma]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment