[Logging] Fix Python 3.8 compatibility

Deluge's logger class extends Python's `logging.Logger`. Since Python
3.8, it takes an additional argument `stacklevel`.
The implementation in Deluge does not support that. Work around the
problem by ignoring additional arguments.

deluge/log.py

@@ -86,7 +86,7 @@ class Logging(LoggingLoggerClass):
     def exception(self, msg, *args, **kwargs):
         yield LoggingLoggerClass.exception(self, msg, *args, **kwargs)
 
-    def findCaller(self, stack_info=False):  # NOQA: N802
+    def findCaller(self, *args, **kwargs):  # NOQA: N802
         f = logging.currentframe().f_back
         rv = '(unknown file)', 0, '(unknown function)'
         while hasattr(f, 'f_code'):