Build/Test Tools: Disable process timeout when running PHPUnit tests …

…via Composer.

When running the full test suite locally via `npm run grunt phpunit` or `composer test`, it is not uncommon for the test run to exceed the Composer's default timeout, causing an error in the middle of the test output:
{{{
The process "..." exceeded the timeout of 300 seconds.
}}}

This commit disables the process timeout for the `composer test` command, allowing the test run to complete successfully.

Follow-up to [47881], [51016].

Props ironprogrammer, robinwpdeveloper, SergeyBiryukov.
Fixes #55919.
Built from https://develop.svn.wordpress.org/trunk@54355


git-svn-id: https://core.svn.wordpress.org/trunk@53914 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta2-54354';
+$wp_version = '6.1-beta2-54355';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.