Is there a sub-version for CI_VERSION, if not why not :)

@kenjis,
> What do you want to know if CI_SUB_VERSION exists?

I recently reported a CI4 Bug but it could not be replicated because the tester used the Composer Version which differs from the the GitHub version.

Edit:
The GitHub commit hash is meaningless and I would prefer a trailing date:

CI_VERSION = 4.1.5-2021-11-28