Inside of the composer.json there is a definition on conflict key and this one is used to define how Composer should handle conflicting versions of dependencies when multiple packages require different versions of the same package. But on that case the error is because conflict key in the composer.json file is set to conflict with itself, which is not a valid configuration
Go to the project root and run $composer validate, it'll return:
./composer.json is invalid, the following errors/warnings were found:
# General errors
- conflict.drupal/ebt_core : a package cannot set a conflict on itselfTo fix that we can remove the conflict key from the composer.json
Fixed
1.4
Code
MR created with the fix: https://git.drupalcode.org/project/ebt_core/-/merge_requests/12