Update GIR files

Author: sdroege

Gtk-4.0.gir

@@ -60729,7 +60729,7 @@ that the stream is in.</doc>
         <doc xml:space="preserve">Whether the stream is currently playing.</doc>
         <type name="gboolean" c:type="gboolean"/>
       </property>
-      <property name="prepared" writable="1" transfer-ownership="none" getter="is_prepared" default-value="FALSE">
+      <property name="prepared" transfer-ownership="none" getter="is_prepared" default-value="FALSE">
         <doc xml:space="preserve">Whether the stream has finished initializing and existence of
 audio and video is known.</doc>
         <type name="gboolean" c:type="gboolean"/>