upgrade CI to run on Ubuntu 20.04

[agunapal]

Description

Upgrading CI CPU to run on Ubuntu 20.04

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

CI should pass

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[msaroufim]

The required checks might need to be changed in settings too

[codecov]

Codecov Report

Merging #2153 (a204af4) into master (92657b2) will not change coverage.
The diff coverage is n/a.

❗ Current head a204af4 differs from pull request most recent head a6bafb6. Consider uploading reports for the commit a6bafb6 to get more accurate results

@@           Coverage Diff           @@
##           master    #2153   +/-   ##
=======================================
  Coverage   53.36%   53.36%           
=======================================
  Files          71       71           
  Lines        3225     3225           
  Branches       56       56           
=======================================
  Hits         1721     1721           
  Misses       1504     1504           

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