[Release] Update unreleased CHANGELOG entries for 11.9.0 (#14466)

Crashlytics/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [fixed] Made on-demand fatal recording thread suspension configurable through setting to imrpove performance and avoid audio glitch on Unity. Change is for framework only.
 
 # 11.7.0

FirebaseAuth/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [changed] Using reCAPTCHA Enterprise and Firebase Auth requires reCAPTCHA
   Enterprise 18.7.0 or later.
 

FirebaseDatabase/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [fixed] Fix connection failure issue introduced in 10.27.0 by restoring the
   Socket Rocket implementation instead of `NSURLSessionWebSocket`. Note that
   this may expose a Thread Performance Checker Warning (#12883).

FirebaseMessaging/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [fixed] Migrate FCM codebase to new NSKeyedUnarchiver APIs. (#14424).
 
 # 11.8.0

FirebaseRemoteConfig/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [fixed] Mark internal `fetchSession` property as `atomic` to prevent a concurrency
   related crash. (#14449)
 

FirebaseVertexAI/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [feature] **Public Preview**: Added support for generating images using the
   Imagen 3 model.
   <br /><br />

Firestore/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.9.0
 - [fixed] Fixed memory leak in `Query.whereField()`. (#13978)
 
 # 11.8.0