This module says there is no other dependency than popperjs. Which is great. But also requires Ckeditor installed to work, which in my opinion is not really a requirement.
I checked the code, and there are several checks to see if ckeditor module is installed. There is no need to force installing it as a dependency via composer and the info file.
Also it would enable users that only want to display tooltips to use this module, even if there is no CKEditor 4/5 installed in the site.
Attempt to install the module, it will force you to enable ckeditor.
Remove the ckeditor dependency from the info file, and remove the composer.json file as it is not required to download this package either.
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I agree with removing the dependency on ckeditor. I have downloaded this patch and tested it locally and it works.
Patch 3 would not apply for me due to the "Information added by Drupal.org" bit so I've created a version with that it in.