only use three version numbers for mac apps

.github/workflows/mac-dmg.yml

@@ -73,7 +73,7 @@ jobs:
           --name Cryptomator
           --vendor "Skymatic GmbH"
           --copyright "(C) 2016 - 2022 Skymatic GmbH"
-          --app-version "${{  steps.versions.outputs.semVerNum }}.${{  steps.versions.outputs.revNum }}"
+          --app-version "${{  steps.versions.outputs.semVerNum }}"
           --java-options "-Xss5m"
           --java-options "-Xmx256m"
           --java-options "-Dcryptomator.appVersion=\"${{  steps.versions.outputs.semVerStr }}\""