Switch to jitpack build for smsmms library

Is the third time the charm?

f-droid does not allow libraries pulled from non-listed maven repositories, thus the build fails in f-droid: https://gitlab.com/fdroid/fdroiddata/-/jobs/3654530159#L236

Found unknown maven repo 'https://invent.kde.org/api/v4/projects/72/packages/maven' at settings.gradle

This MR changes to use jitpack, which is an allowed repository.