fix await method

Author: Creeper19472

src/serious_python/bin/package_command.dart

@@ -434,7 +434,7 @@ class PackageCommand extends Command {
       stdout.writeln(
           "Creating app archive at ${dest.path} from a temp directory");
       final encoder = ZipFileEncoder();
-      encoder.zipDirectory(tempDir, filename: dest.path);
+      await encoder.zipDirectory(tempDir, filename: dest.path);
 
       // create hash file
       stdout.writeln("Writing app archive hash to ${dest.path}.hash");

src/serious_python_platform_interface/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
     sdk: flutter
   plugin_platform_interface: ^2.1.8
   path_provider: ^2.1.3
-  archive: ^3.6.1
+  archive: ^4.0.7
   path: ^1.9.0
 
 dev_dependencies: