misc: smithy-kotlin version bump

Author: 0marperez

gradle/libs.versions.toml

@@ -12,8 +12,8 @@ atomicfu-version = "0.25.0"
 binary-compatibility-validator-version = "0.16.3"
 
 # smithy-kotlin codegen and runtime are versioned separately
-smithy-kotlin-runtime-version = "1.3.31"
-smithy-kotlin-codegen-version = "0.33.31"
+smithy-kotlin-runtime-version = "1.4.0"
+smithy-kotlin-codegen-version = "0.4.0"
 
 # codegen
 smithy-version = "1.51.0"