update generated code (#658)

Author: async-aws-bot

src/Sts/StsClient.php

@@ -172,6 +172,20 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'sts',
                     'signVersions' => ['v4'],
                 ];
+            case 'us-gov-east-1-fips':
+                return [
+                    'endpoint' => 'https://sts.us-gov-east-1.amazonaws.com',
+                    'signRegion' => 'us-gov-east-1',
+                    'signService' => 'sts',
+                    'signVersions' => ['v4'],
+                ];
+            case 'us-gov-west-1-fips':
+                return [
+                    'endpoint' => 'https://sts.us-gov-west-1.amazonaws.com',
+                    'signRegion' => 'us-gov-west-1',
+                    'signService' => 'sts',
+                    'signVersions' => ['v4'],
+                ];
             case 'us-west-1-fips':
                 return [
                     'endpoint' => 'https://sts-fips.us-west-1.amazonaws.com',