Use a more stable sorting for the region metadata (#2014)

Sorting region groups based on the numer of regions in the group
generates some unnecessary changes during SDK updates when adding a new
region in a group.

Author: stof

CHANGELOG.md

@@ -15,6 +15,7 @@
 
 - Apply new CodingStandard from latest php-cs-fixer.
 - AWS enhancement: Documentation updates.
+- Use a more stable sorting for the list of generated region metadata
 
 ## 3.8.0
 

src/DynamoDbClient.php

@@ -1201,6 +1201,13 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'dynamodb',
                     'signVersions' => ['v4'],
                 ];
+            case 'eu-isoe-west-1':
+                return [
+                    'endpoint' => 'https://dynamodb.eu-isoe-west-1.cloud.adc-e.uk',
+                    'signRegion' => 'eu-isoe-west-1',
+                    'signService' => 'dynamodb',
+                    'signVersions' => ['v4'],
+                ];
             case 'us-iso-east-1':
             case 'us-iso-west-1':
                 return [
@@ -1225,13 +1232,6 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'dynamodb',
                     'signVersions' => ['v4'],
                 ];
-            case 'eu-isoe-west-1':
-                return [
-                    'endpoint' => 'https://dynamodb.eu-isoe-west-1.cloud.adc-e.uk',
-                    'signRegion' => 'eu-isoe-west-1',
-                    'signService' => 'dynamodb',
-                    'signVersions' => ['v4'],
-                ];
         }
 
         return [