klippy: Replace logging.warn usage with logging.warning

logging.warn is an alias to logging.warning since Python 3.3 and will be
removed in Python 3.13.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>

klippy/configfile.py

@@ -316,7 +316,7 @@ class PrinterConfig:
         self.printer.set_rollover_info("config", "\n".join(lines))
     # Status reporting
     def runtime_warning(self, msg):
-        logging.warn(msg)
+        logging.warning(msg)
         res = {'type': 'runtime_warning', 'message': msg}
         self.runtime_warnings.append(res)
         self.status_warnings = self.runtime_warnings + self.deprecate_warnings