[MAINT] Make github workflow format openapi.json

[peytondmurray]

Fixes #870.

Description

This pull request runs jq to format the generated openapi.json in a more human readable format. This also inserts a newline at the end of the file so that pre-commit.ci stops failing on all PRs.

I've also made jq sort the json by keys, which should make the order nice and stable.

Pull request checklist

• [x] Did you test this change locally?
• [x] Did you update the documentation (if required)?
• [x] Did you add/update relevant tests for this change (if required)?

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