Improve release workflow

[ydah]

This PR improves the release workflow. It turns out that being able to push directly to the default branch is quite difficult. That's because if GitHub actions can push to a protected branch, all you have to do is code a workflow that creates a branch and pushes it to other branches, and any collaborator in the repository can push whatever code they want to any branch. https://github.com/orgs/community/discussions/25305#discussioncomment-3247401

That last one step might be a pain, but I think it's better to automate it to the point where you create a PR that switches back versions. After the release workflow, a PR is created that switches back, so we should just merge it.

Note that this requires the following settings to be checked on:

---

Before submitting the PR make sure the following are checked:

• [x] Feature branch is up-to-date with master (if not - rebase it).
• [x] Squashed related commits together.
• [-] Added tests.
• [-] Updated documentation.
• [-] Added an entry to the CHANGELOG.md if the new code introduces user-observable changes.
• [x] The build (bundle exec rake) passes (be sure to run this locally, since it may produce updated documentation that you will need to commit).

[ydah]

@bquorning I don't have permission, so please check if the following settings are checked ON.

[bquorning]

Yep, the setting is ON.