fix: bump smithy-kotlin to pick up chunked stream byte counting fixes

Author: ianbotsf

.changes/6f980213-c40e-45ac-aaac-4643830f85a3.json

@@ -0,0 +1,8 @@
+{
+    "id": "6f980213-c40e-45ac-aaac-4643830f85a3",
+    "type": "bugfix",
+    "description": "Bump **smithy-kotlin** to verion **1.5.6** to pick up fixes for chunked stream byte counting",
+    "issues": [
+        "https://github.com/smithy-lang/smithy-kotlin/issues/1285"
+    ]
+}

gradle/libs.versions.toml

@@ -12,8 +12,8 @@ atomicfu-version = "0.29.0"
 binary-compatibility-validator-version = "0.18.0"
 
 # smithy-kotlin codegen and runtime are versioned separately
-smithy-kotlin-runtime-version = "1.5.4"
-smithy-kotlin-codegen-version = "0.35.4"
+smithy-kotlin-runtime-version = "1.5.6"
+smithy-kotlin-codegen-version = "0.35.6"
 
 # codegen
 smithy-version = "1.60.2"