Updated PHPunit

[snipe]

This should handle the deprecation notices when running composer update. I ran these using PHP8.1.29, so hopefully it will work though to PHP 8.3

[what-the-diff]

PR Summary

The proposed changes primarily revolve around updating various software dependencies used by the project and enhancing its performance. They are as follows:

• Addition of "ext-exif": "*" to the suggest section
  The ext-exif extension has been suggested for possible inclusion in the future projects. This will allow better handling and working with metadata from images, improving the functionality or utility of applications dealing with such data.

• Addition of "larastan/larastan": "^2.9" to the require-dev section
  Larastan has been added to the list of development requirements. It helps ensure code quality by analyzing the code to detect potential errors, making the development process more reliable.

• Updates to two important dependencies:
  The versions of "php-mock/php-mock-phpunit" and "phpunit/phpunit" have been updated. Updating these dependencies makes sure we benefit from all the latest improvements, bug fixes, and security patches, ensuring efficiency and reliability of the application.

• Removal of requirement for "nunomaduro/larastan": "^2.0"
  Larastan was being used to help uncover possible bugs or issues with the code. Its removal from the requirements could mean that our project has moved towards other debugging or static analysis tools.