Add Composer\Config::disableProcessTimeout() when running serve

[crynobone]

Avoid following issues:

The following exception is caused by a process timeout
Check https://getcomposer.org/doc/06-config.md#process-timeout for details

In Process.php line 1204:
                                                                                                                                               
  The process "'/opt/homebrew/Cellar/php@8.1/8.1.17/bin/php' -d allow_url_fopen='1' -d disable_functions='' -d memory_limit='1536M' vendor/bi  
  n/testbench serve" exceeded the timeout of 300 seconds.                                                                                      

[coveralls]

coverage: 85.414%. remained the same when pulling 81d13e0 on patch-1 into f550ac3 on 8.x.