Mark many attributes as read-only properties (#7591)

stubs/JACK-Client/jack/__init__.pyi

@@ -161,8 +161,10 @@ class Port:
     def unset_alias(self, alias: str) -> None: ...
     @property
     def uuid(self) -> str: ...
-    is_audio: bool = ...
-    is_midi: bool = ...
+    @property
+    def is_audio(self) -> bool: ...
+    @property
+    def is_midi(self) -> bool: ...
     @property
     def is_input(self) -> bool: ...
     @property