[PHP8] - call_user_func_array problems

Problem/Motivation

call_user_func_array calls callback function using named arguments if an array with keys is passed to $args and if the array passed has only values, arguments are passed positionally.

Steps to reproduce

1) Create a webform with any element.
2) Submit one response.
3) Run the drush command to export the webform submissions drush webform-export webform_id.

The error below is triggered:
[error] Error: Unknown named parameter $webform in call_user_func_array() (line 29 of /app/modules/contrib/webform/src/Commands/WebformCommands.php) #0 /app/modules/contrib/webform/src/Commands/WebformCommands.php(29): call_user_func_array(Array, Array)

See: https://www.php.net/manual/en/function.call-user-func-array.php#125953

Proposed resolution

Ensure that call_user_func_array works with PHP 8 as well.