chore: release 1.6.15

Author: aws-sdk-kotlin-ci

.changes/0c6de8ff-1483-4c9b-b134-097aaf072ae9.json

@@ -1,5 +1,15 @@
 # Changelog
 
+## [1.6.15] - 06/10/2026
+
+### Features
+* [#363](https://github.com/smithy-lang/smithy-kotlin/issues/363) Add support for Smithy's [`@requiresLength`](https://smithy.io/2.0/spec/streaming.html#smithy-api-requireslength-trait) and verify that annotated blob shapes include a `Content-Length`
+
+### Fixes
+* Validate that OkHttp header values do not contain CR or LF
+* Limit exponent scale to prevent OOM errors when expanding exponents
+* Limit serde parsing depth to 1,000 levels of nesting to prevent `StackOverflowError`
+
 ## [1.6.14] - 05/08/2026
 
 ### Features

.changes/31cb979a-e70c-4d6c-b5d3-9745ee91bdd1.json

@@ -15,7 +15,7 @@ org.gradle.jvmargs=-Xmx4G -XX:MaxMetaspaceSize=2G
 org.gradle.parallel=true
 
 # SDK
-sdkVersion=1.6.15-SNAPSHOT
+sdkVersion=1.6.15
 
 # codegen
 codegenVersion=0.35.44-SNAPSHOT