Update syncthing to version 1.20.0 / rev 121 via SR 974783
    
    https://build.opensuse.org/request/show/974783
    by user mkittler + dimstar_suse
    - Update to 1.20.0
      * Bugfixes:
        #7855: Watching for changes using too many system resources on BSDs (kqueue)
        #8020: Dangling symlink prevents filesystem watcher on Solaris
        #8232: Missing include file endlessly spams log
        #8258: The latest version does not support go1.18 compilation!!
        #8261: TypeError: Cannot read properties of null (reading 'status') in the GUI after killing Syncthing
      * Enhancements:
        #8202: Indicate folders / devices where the remote end has not accepted sharing.
        #8282: Change default log format to include date
      * Other issues:
        #8279: Simplify tests using T.TempDir