[REF][PHP8.1] Fix Extension Manager Module test failures on php8.1 du…

[seamuslee001]

…e to passing in null to dirname

Overview

This fixes a couple of test errors on php8.1

Before

Following test errors on php8.1

1) CRM_Extension_Manager_ModuleTest::testInstall_DirtyRemove_Disable_Uninstall
dirname(): Passing null to parameter #1 ($path) of type string is deprecated

/home/seamus/buildkit/build/dtest/web/sites/all/modules/civicrm/Civi/Api4/Service/LegacySpecScanner.php:56

2) CRM_Extension_Manager_ModuleTest::testInstall_DirtyRemove_Disable_Restore
dirname(): Passing null to parameter #1 ($path) of type string is deprecated

/home/seamus/buildkit/build/dtest/web/sites/all/modules/civicrm/Civi/Api4/Service/LegacySpecScanner.php:56

After

No Test errors in php8.1 from these tests

ping @eileenmcnaughton @demeritcowboy @totten

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).