Hook into (f.t) prerelease-changelog-update workflow and also update wporg related versions in other files

[carstingaxion]

What has changed?:

Why was it needed?:

Need(ed) to change "Stable tag:" and "version" in readme.md and package.json manually for too long.

If forgotten, the following "plugin review guidelines" will trigger an error on ',mismatched version numbers'. I know

How was it done?:

Links to trello Tickets or github issues:

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Code Checklist

• [ ] tested
• [ ] documented