Appstream complains about the image

[Carmina16]

https://github.com/babluboy/bookworm/blob/36fc5d4916b0861b8b91800837d182715de0caea/data/com.github.babluboy.bookworm.appdata.xml.in#L18

This image contains a transparent margin that causes a validation error by appstream-util, causing the build to fail. Please crop the image or change the validation mode to validate-relax.