chore(changelog): Update models to latest [ci-skip]

Co-authored-by: Michael Law <[email protected]>
Co-authored-by: Sebastian Villena <[email protected]>

CHANGELOG.md

@@ -1,10 +1,20 @@
----
-
 # AWS Mobile SDK for iOS CHANGELOG
 
 ## Unreleased
 
--Features for next release
+### Misc. Updates
+
+- Model updates for the following services
+  - AWSKinesisVideoArchivedMedia
+  - AWSLocation
+  - AWSComprehend
+  - AWSIoT
+  - AWSKMS
+  - AWSPinpoint
+  - AWSFirehose
+  - AWSCognitoIdentityProvider
+  - AWSEC2
+  - AWSConnect
 
 ## 2.33.7