Update to Copier template 0.3.7

[lkubb]

What does this PR do?

Updates the Copier template to 0.3.7.

• Fixes the docs build in CI
• Publishes docs to GitHub Pages

What issues does this PR fix or reference?

Fixes:

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

[max-arnold]

@lkubb I'm on vacation at the moment, will be able to take a look in August

[lkubb]

@max-arnold Thanks for the response! No worries, hope you enjoy your vacation. :)

It's just a boilerplate update, but I didn't feel comfortable overriding the branch protection.

[lkubb]

@max-arnold Thanks for reviewing and sorry for dismissing, opted to update this again to avoid CI failures after a merge with the new workflow permissions.

Maybe you can check out the new commit as well. If you're fine with the changes here, I don't think we'll need separate reviews for similar updates to the other extension repos.

To enable the docs publishing, this update currently needs to happen manually once for each existing extension repo (while writing this, I think I could make it automatic in a new template version). Most further updates can be handled using the new Renovate support for Copier (my initial PR allowed defining organization-wide template defaults, which would have made this process automatic, but the Renovate maintainers did not want to include any Copier-specific configuration in the initial release). Just need to wait for one Copier fix I submitted last week that avoids recreation of deleted files.

[max-arnold]

LGTM