release body is duplicated

[sensuikan1973]

https://github.com/sensuikan1973/libedax4dart/releases

Fix create-release workflow with following sensuikan1973/edax_runner#437

[google-labs-jules]

Jules is on it. When finished, you will see another comment and be able to review a PR.

[google-labs-jules]

Ready for a review! A PR has been created.