Update AWS models (#808)

## Motivation and Context
Update AWS models based on the latest ones on 5/18/2023.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Co-authored-by: Yuki Saito <awsaito@amazon.com>

Author: ysaito1001

aws-models/amplifybackend.json

@@ -1104,7 +1104,6 @@
                 "ExpirationTime": {
                     "target": "com.amazonaws.amplifybackend#__double",
                     "traits": {
-                        "smithy.api#default": 0,
                         "smithy.api#documentation": "<p>The API key expiration time for API_KEY, if it was used as an authentication mechanism to access your data models.</p>",
                         "smithy.api#jsonName": "expirationTime"
                     }
@@ -1734,7 +1733,6 @@
                 "UnauthenticatedLogin": {
                     "target": "com.amazonaws.amplifybackend#__boolean",
                     "traits": {
-                        "smithy.api#default": false,
                         "smithy.api#documentation": "<p>Set to true or false based on whether you want to enable guest authorization to your Amplify app.</p>",
                         "smithy.api#jsonName": "unauthenticatedLogin",
                         "smithy.api#required": {}
@@ -1834,7 +1832,6 @@
                 "MinimumLength": {
                     "target": "com.amazonaws.amplifybackend#__double",
                     "traits": {
-                        "smithy.api#default": 0,
                         "smithy.api#documentation": "<p>The minimum length of the password used to access the backend of your Amplify project.</p>",
                         "smithy.api#jsonName": "minimumLength",
                         "smithy.api#required": {}
@@ -2948,7 +2945,6 @@
                 "IsSuccess": {
                     "target": "com.amazonaws.amplifybackend#__boolean",
                     "traits": {
-                        "smithy.api#default": false,
                         "smithy.api#documentation": "<p>Indicates whether the request succeeded or failed.</p>",
                         "smithy.api#jsonName": "isSuccess"
                     }
@@ -3731,7 +3727,6 @@
                 "Imported": {
                     "target": "com.amazonaws.amplifybackend#__boolean",
                     "traits": {
-                        "smithy.api#default": false,
                         "smithy.api#documentation": "<p>Returns True if the storage resource has been imported.</p>",
                         "smithy.api#jsonName": "imported",
                         "smithy.api#required": {}
@@ -4171,7 +4166,6 @@
                 "MaxResults": {
                     "target": "com.amazonaws.amplifybackend#__integerMin1Max25",
                     "traits": {
-                        "smithy.api#default": 0,
                         "smithy.api#documentation": "<p>The maximum number of results that you want in the response.</p>",
                         "smithy.api#jsonName": "maxResults"
                     }
@@ -4572,7 +4566,6 @@
                 "CleanAmplifyApp": {
                     "target": "com.amazonaws.amplifybackend#__boolean",
                     "traits": {
-                        "smithy.api#default": false,
                         "smithy.api#documentation": "<p>Cleans up the Amplify Console app if this value is set to true.</p>",
                         "smithy.api#jsonName": "cleanAmplifyApp"
                     }
@@ -5198,7 +5191,6 @@
                 "UnauthenticatedLogin": {
                     "target": "com.amazonaws.amplifybackend#__boolean",
                     "traits": {
-                        "smithy.api#default": false,
                         "smithy.api#documentation": "<p>A boolean value that can be set to allow or disallow guest-level authorization into your Amplify app.</p>",
                         "smithy.api#jsonName": "unauthenticatedLogin"
                     }
@@ -5292,7 +5284,6 @@
                 "MinimumLength": {
                     "target": "com.amazonaws.amplifybackend#__double",
                     "traits": {
-                        "smithy.api#default": 0,
                         "smithy.api#documentation": "<p>Describes the minimum length of the password required to sign in to the auth resource, configured as a part of your Amplify project.</p>",
                         "smithy.api#jsonName": "minimumLength"
                     }
@@ -5855,21 +5846,14 @@
             }
         },
         "com.amazonaws.amplifybackend#__boolean": {
-            "type": "boolean",
-            "traits": {
-                "smithy.api#default": false
-            }
+            "type": "boolean"
         },
         "com.amazonaws.amplifybackend#__double": {
-            "type": "double",
-            "traits": {
-                "smithy.api#default": 0
-            }
+            "type": "double"
         },
         "com.amazonaws.amplifybackend#__integerMin1Max25": {
             "type": "integer",
             "traits": {
-                "smithy.api#default": 0,
                 "smithy.api#range": {
                     "min": 1,
                     "max": 25