update PR number

Author: David Motsonashvili

firebase-ai/CHANGELOG.md

@@ -4,7 +4,7 @@
 * [feature] added support for Imagen Editing, including inpainting, outpainting, control, style 
   transfer, and subject references (#7075)
 * [changed] Added a `dilation` parameter to `ImagenMaskReference.generateMaskAndPadForOutpainting`
-* (#9999)
+* (#7260)
 
 # 17.0.0
 * [feature] Added support for configuring the "thinking" budget when using Gemini