Remove parse error forsystemd's useless OSC 3008 context protocol

It's spamming the test logs. Just ignore it silently

kitty/window.py

@@ -1286,6 +1286,9 @@ class Window:
         if self.override_title is None:
             self.title_updated()
 
+    def osc_context(self, ctx_data: memoryview) -> None:
+        pass  # this is systemd's useless OSC 3008 context protocol
+
     def icon_changed(self, new_icon: memoryview) -> None:
         pass  # TODO: Implement this