Fixing get system query params type (#6624)

Author: galvana

clients/admin-ui/src/features/system/system.slice.ts

@@ -45,6 +45,7 @@ export type ConnectionConfigSecretsRequest = {
 export type GetSystemsQueryParams = {
   data_stewards?: string[];
   system_groups?: string[];
+  show_deleted?: boolean;
 };
 
 const systemApi = baseApi.injectEndpoints({