Nightly

[hemanth1823]

To clear the annotations warning in workflow, I would like to suggest this change.
(Initial Warning obtained in summary part of workflow actions : Ubuntu-latest workflows will use Ubuntu-20.04 soon)

Changed runs-on in update-nightly.yml from ubuntu-latest to Ubuntu-20.04

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[hemanth1823]

I have just made an entry to cla from : https://opensource.google/docs/cla/

[mihaimaruseac]

This PR seems to have been merged automatically as a side effect. However, from the merge commit I don't see anything related to the PR description.