build: upgrading ubuntu20 in ci.yml

[awais786]

Analytics Pipeline Pull Request

Make sure that the following steps are done before merging:

• [ ] If you have a migration please contact data engineering team before merging.
• [ ] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [ ] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #877 (6f528c0) into master (b78ef98) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #877   +/-   ##
=======================================
  Coverage   76.38%   76.38%           
=======================================
  Files         150      150           
  Lines       17128    17128           
=======================================
  Hits        13083    13083           
  Misses       4045     4045           

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