Update Release Notes in readme.md for FlatBuffers v25.2.10 upgrade

Author: AustinBenoit

messaging/messaging_java/build.gradle

@@ -20,10 +20,6 @@ buildscript {
   dependencies {
     classpath 'com.android.tools.build:gradle:7.4.2'
     classpath 'com.google.gms:google-services:4.4.1'
-    // This uses Flatbuffers at 1.9 because the 1.10 version added a feature
-    // that requires using a newer version of the JDK and at least Android N.
-    // This has already been fixed at head, but a tagged release is not yet
-    // available with that fix.
     classpath 'com.google.flatbuffers:flatbuffers-java:25.2.10'
   }
 }

release_build_files/readme.md

@@ -615,7 +615,8 @@ code.
 ## Release Notes
 ### Upcoming
 - Changes
-    - Remote Config (Desktop): Updated Flatbuffers to latest version to support buffer verification. Added flexbuffer integrity checks before parsing to prevent crashes on invalid/malformed data.
+    - General: Upgraded FlatBuffers dependency to v25.2.10 across both native C++ and Java/Android components.
+    - Remote Config (Desktop): Added flexbuffer integrity checks before parsing to prevent crashes on invalid/malformed data.
 
 ### 13.9.0
 - Changes