chore: release 0.12.6

Author: aws-sdk-kotlin-ci

.changes/0c737e4d-adb6-45f4-95d3-7123f3455171.json

@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.12.6] - 09/19/2022
+
+### Features
+* Add support for full duplex HTTP exchanges
+
+### Fixes
+* Fix occasional stream leak due to race condition in CRT engine
+* [#678](https://github.com/awslabs/smithy-kotlin/issues/678) Fix the calculation of file lengths on `ByteStream`s from `Path`s
+* Properly check if a member can be nullable
+
+### Miscellaneous
+* Provide an explicit scope for request bound work
+
 ## [0.12.5] - 08/18/2022
 
 ### Fixes

.changes/2310b190-0074-4d42-89c4-8229b0197609.json

@@ -9,7 +9,7 @@ kotlin.native.ignoreDisabledTargets=true
 #kotlin.mpp.hierarchicalStructureSupport=false
 
 # SDK
-sdkVersion=0.12.6-SNAPSHOT
+sdkVersion=0.12.6
 
 # kotlin
 kotlinVersion=1.7.10