fix: upgrade to latest smithy-kotlin version (#1323)

Author: ianbotsf

gradle/libs.versions.toml

@@ -9,8 +9,8 @@ coroutines-version = "1.7.3"
 atomicfu-version = "0.23.1"
 
 # smithy-kotlin codegen and runtime are versioned separately
-smithy-kotlin-runtime-version = "1.2.5"
-smithy-kotlin-codegen-version = "0.32.5"
+smithy-kotlin-runtime-version = "1.2.6"
+smithy-kotlin-codegen-version = "0.32.6"
 
 # codegen
 smithy-version = "1.47.0"