In PHPUnit 10.3.5, 9.6.13 and 8.5.34, the child processes used for process isolation now use temporary files to communicate their result to the parent process.
This caused a failure in some tests that set the `open_basedir` PHP directive to a value that did not include `sys_get_temp_dir()`.
This adds `sys_get_temp_dir()` to the `open_basedir` value set by the tests to ensure that permission is still granted for the temporary directory.
PHPUnit uses `sys_get_temp_dir()`. To ensure the result is the same, Core's `get_temp_dir()` function is not used.
References:
- https://github.com/sebastianbergmann/phpunit/issues/5356
Props desrosj, mukesh27, SergeyBiryukov, costdev.
Fixes#59394.
git-svn-id: https://develop.svn.wordpress.org/trunk@56622 602fd350-edb4-49c9-b593-d223f7449a82
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