Consider all active repositories for generated acknowledgements.

While testing this I noticed the non trivial problem, that for the newly considered repos no release tags are available (yet).
To solve this, we could either add tags to these repositories, but this again would be a non trivial task.
Alternatively in the new repositories the commits belonging to a release could be computed based on their dates.
There is now an 'API' that provides the SimRel dates, e.g.:
https://github.com/eclipse-simrel/.github/blob/main/wiki/SimRel/2026-06_dates.json

The Github REST API also provides means to obtain all commits between two dates:
https://docs.github.com/en/rest/commits/commits?apiVersion=2026-03-10#list-commits

Fixes #485

CC @BeckerWdf