Add UUID for upgrading (#5391)

* Add UUID for upgrading

In my understanding generating two installers with different versions and same --win-upgrade-uuid should uninstall another version during installation, i.e. this is needed to have a proper upgrade instead of a parallel installation of two JabRef versions.

* add missing ','

build.gradle

@@ -582,6 +582,7 @@ jlink {
             installerOptions = [
                     '--vendor', 'JabRef',
                     '--app-version', "${project.version}",
+                    '--win-upgrade-uuid', 'd636b4ee-6f10-451e-bf57-c89656780e36',
                     '--win-dir-chooser',
                     '--win-shortcut'
             ]