Update release version and add notes for dependency updates.

Author: jonsimantov

cpp_sdk_version.json

@@ -1,5 +1,5 @@
 {
- "released": "11.8.0",
- "stable": "11.8.0",
- "head": "11.8.0"
+ "released": "11.9.0",
+ "stable": "11.9.0",
+ "head": "11.9.0"
 }

release_build_files/readme.md

@@ -632,8 +632,9 @@ code.
 
 ## Release Notes
 ### Upcoming Release
-- Changes
- - General (Android): Update to Firebase Android BoM version 32.7.2.
+- 11.9.0
+ - General (Android): Update to Firebase Android BoM version 32.7.3.
+ - General (iOS): Update to Firebase Cocoapods version 10.22.0.
  - Auth: Add User::SendEmailVerificationBeforeUpdatingEmail, a new method to
  verify and change the User's email.
  - Auth: Deprecate the older method of updating emails, User::UpdateEmail.