Deprecation notices in PHP8

Hi,

There are some deprecation notices in PHP 8.2:

Deprecated: Creation of dynamic property HelloBarForWordPress::$url_path is deprecated in /Users/me/Valet/example/www/app/plugins/hellobar/hellobar.php on line 40

Deprecated: Creation of dynamic property HelloBarForWordPress::$option_name is deprecated in /Users/me/Valet/example/www/app/plugins/hellobar/hellobar.php on line 46

Deprecated: Creation of dynamic property HelloBarForWordPress::$options is deprecated in /Users/me/Valet/example/www/app/plugins/hellobar/hellobar.php on line 149

Can you please fix these?
See: https://php.watch/versions/8.2/dynamic-properties-deprecated