Updates of your app at the F-Droid repository are currently stuck. Reason is the updater no longer can identify new versions, as you're using variables for versionCode and versionName in your build.gradle – but the updater needs the "real values" there (it just parses the build.gradle, it does not execute gradlew).

If you want F-Droid to pick up again,

        versionCode = Apps.versionCode
        versionName = Apps.versionName

must be changed to reflect the real values, currently this would be

        versionCode = 10102
        versionName = "1.0.3"