[Release] Update `Unreleased` changelog entries for 11.5.0 (#14034)

Crashlytics/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.5.0
 - [changed] Updated `upload-symbols` to version 3.19, removed all methods require CFRelease and switch to modern classes (#13420).
 
 # 11.4.0

FirebaseMessaging/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.5.0
 - [fixed] Improve token-fetch failure logging with detailed error info. (#13997).
 
 # 11.0.0

FirebaseRemoteConfig/CHANGELOG.md

@@ -1,4 +1,4 @@
-# Unreleased
+# 11.5.0
 - [fixed] Mark two internal properties as `atomic` to prevent concurrency
   related crash. (#13898)