CompatHelper: bump compat for EarthSciMLBase to 0.20 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the EarthSciMLBase package from 0.19 to 0.19, 0.20 for package docs.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[github-actions]

Thanks for your contribution! Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by posting a comment with the below format:

---

I have reviewed and hereby sign the CLA

---

CompatHelper Julia seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}