[Backport 8.x] Add missing allow_restricted_indices to cross cluster api key APIs (#3131)

Co-authored-by: Quentin Pradet <[email protected]>

Author: github-actions[bot]

specification/security/_types/Privileges.ts

@@ -382,6 +382,11 @@ export class ReplicationAccess {
    * A list of indices (or index name patterns) to which the permissions in this entry apply.
    */
   names: IndexName[]
+  /**
+   * This needs to be set to true if the patterns in the names field should cover system indices.
+   * @server_default false
+   */
+  allow_restricted_indices?: boolean
 }
 
 export class SearchAccess {