Clean detected current version: replace + sign by -

check_forgejo_upgrade

@@ -74,6 +74,9 @@ if not CURRENT:
     print(EXCEPTION if EXCEPTION else "")
     sys.exit(3)
 
+CURRENT = CURRENT.replace('+', '-')
+logging.debug('Cleaned current version: %s', CURRENT)
+
 LATEST = None
 try:
     logging.debug("Get releases RSS feed from %s...", options.url)