chore: sync models and bump smithy-kotlin version (#1031)

Author: aajtodd

.changes/174500f5-aa97-40f8-9778-f144aa92d8aa.json

@@ -0,0 +1,5 @@
+{
+    "id": "174500f5-aa97-40f8-9778-f144aa92d8aa",
+    "type": "misc",
+    "description": "Sync AWS models"
+}

.changes/4557c47b-cc3a-4f49-9848-34617a35c5bf.json

@@ -0,0 +1,8 @@
+{
+    "id": "4557c47b-cc3a-4f49-9848-34617a35c5bf",
+    "type": "bugfix",
+    "description": "Update smithy-kotlin to 0.26.0",
+    "issues": [
+        "awslabs/aws-sdk-kotlin#1029"
+    ]
+}