gdk: Generate MemoryTextureBuilder

Author: sophie-h

gdk4/Gir.toml

@@ -566,6 +566,14 @@ name = "Gdk.MemoryTexture"
 status = "generate"
 concurrency = "send+sync"
 
+[[object]]
+name = "Gdk.MemoryTextureBuilder"
+status = "generate"
+concurrency = "send+sync"
+    [[object.function]]
+    name = "set_update_region"
+    manual = true # mutability error
+
 [[object]]
 name = "Gdk.Monitor"
 status = "generate"
@@ -668,4 +676,4 @@ name = "Gdk.ToplevelState"
 status = "generate"
     [[object.member]]
     name = "suspended"
-    version = "4.12"
+    version = "4.12"