F-Droid can't build

As https://github.com/Infomaniak/android-kMail/blob/1.16.0/app/build.gradle#L105 depends on https://github.com/Infomaniak/android-core/blob/b0a8a06bd01701015f3b639b5303780de001ada8/gradle/core.versions.toml#L68C25-L68C58 which is not FOSS: https://mvnrepository.com/artifact/com.google.android.play/integrity/1.4.0