PHP Deprecated: Creation of dynamic property is deprecated on PHP 8.3

[kodie]

Ran into this error while running the module:export command:

PHP Deprecated:  Creation of dynamic property HappyMedium\Flex\Cli\ModuleExportCommand::$themePath is deprecated in /Users/kodiegrantham/www/misc/flex-cli/src/ModuleExportCommand.php on line 23

Deprecated: Creation of dynamic property HappyMedium\Flex\Cli\ModuleExportCommand::$themePath is deprecated in /Users/kodiegrantham/www/misc/flex-cli/src/ModuleExportCommand.php on line 23

using PHP 8.3.4. I tried fixing it here f47aa69 but it caused issues with setting the theme path so I reverted it (7db3a7a).