Regenerate spanner client (#6191)

Generated in GitHub action: https://togithub.com/googleapis/googleapis/google-api-php-client-services/actions/workflows/codegen.yaml

Author: yoshi-code-bot

src/Spanner/Backup.php

@@ -56,6 +56,8 @@ class Backup extends \Google\Collection
    * @var string
    */
   public $incrementalBackupChainId;
+  protected $instancePartitionsType = BackupInstancePartition::class;
+  protected $instancePartitionsDataType = 'array';
   /**
    * @var string
    */
@@ -229,6 +231,20 @@ public function getIncrementalBackupChainId()
   {
     return $this->incrementalBackupChainId;
   }
+  /**
+   * @param BackupInstancePartition[]
+   */
+  public function setInstancePartitions($instancePartitions)
+  {
+    $this->instancePartitions = $instancePartitions;
+  }
+  /**
+   * @return BackupInstancePartition[]
+   */
+  public function getInstancePartitions()
+  {
+    return $this->instancePartitions;
+  }
   /**
    * @param string
    */