Abandon Laravel 10 testing

Simplifies management

Author: Vectorial1024

.github/workflows/ubuntu_l10.yml

@@ -61,27 +61,25 @@ PHPUnit via Composer script:
 composer run-script test
 ```
 
-**Note**: only the latest version of Laravel and its "past-compatible versions" (i.e., past versions with a compatible `artisan` file) are tested to simplify `artisan` mocking.
-This should not cause test incompleteness because the Laravel framework API is very likely compatible across versions.
-
 Latest cross-platform testing results:
 |Runtime|Ubuntu|Windows|
 |---|---|---|
-|Laravel 10 (PHP 8.1)|[![Build-U-L10-PHP80100][build-u-l10-php80100-image]][build-u-l10-php80100-url]|[![Build-W-L10-PHP80100][build-w-l10-php80100-image]][build-u-l10-php80100-url]|
+|Laravel 10 (PHP 8.1)|skipped*|skipped*|
 |Laravel 11 (PHP 8.2)|[![Build-U-L11-PHP80200][build-u-l11-php80200-image]][build-u-l11-php80200-url]|[![Build-W-L11-PHP80200][build-w-l11-php80200-image]][build-w-l11-php80200-url]|
 |Laravel 12 (PHP ???)|🛠️|🛠️|
 
+\*Note: tests for these Laravel versions are skipped because they have old `artisan` file contents:
+- It is difficult to mock multi-version `artisan` files for different Laravel versions (see ![#6][https://github.com/Vectorial1024/laravel-process-async/issues/6]).
+- It is rare for the `artisan` file at Laravel to be updated
+- The actual behavior is expected to be the same.
+
 [packagist-url]: https://packagist.org/packages/vectorial1024/laravel-process-async
 [packagist-stats-url]: https://packagist.org/packages/vectorial1024/laravel-process-async/stats
 [github-repo-url]: https://github.com/Vectorial1024/laravel-process-async
 
-[build-u-l10-php80100-url]: https://github.com/Vectorial1024/laravel-process-async/actions/workflows/ubuntu_l10.yml
-[build-u-l10-php80100-image]: https://img.shields.io/github/actions/workflow/status/Vectorial1024/laravel-process-async/ubuntu_l10.yml?style=plastic
 [build-u-l11-php80200-url]: https://github.com/Vectorial1024/laravel-process-async/actions/workflows/ubuntu_l11.yml
 [build-u-l11-php80200-image]: https://img.shields.io/github/actions/workflow/status/Vectorial1024/laravel-process-async/ubuntu_l11.yml?style=plastic
 
-[build-w-l10-php80100-url]: https://github.com/Vectorial1024/laravel-process-async/actions/workflows/windows_l10.yml
-[build-w-l10-php80100-image]: https://img.shields.io/github/actions/workflow/status/Vectorial1024/laravel-process-async/windows_l10.yml?style=plastic
 [build-w-l11-php80200-url]: https://github.com/Vectorial1024/laravel-process-async/actions/workflows/windows_l11.yml
 [build-w-l11-php80200-image]: https://img.shields.io/github/actions/workflow/status/Vectorial1024/laravel-process-async/windows_l11.yml?style=plastic