Changelog and/or GitHub release format breaks RenovateBot

[jelhan]

RenovateBot includes the relevant changelog in a PR created by default. This does not work for ember-cli-showdown. I assume RenovateBot struggles mapping a release to a changelog entry. Not sure how that's down normally. But honestly I also feel the current format not that readable as a human.

Release name:

v9.0.0-ember-cli-showdown: Merge pull request #142 from empress/release-preview

Changelog headline:

Release (2024-02-07)

Example of a PR created by RenovateBot missing the changelog: ember-bootstrap/ember-bootstrap#2089