test: fix incorrect condition in AbstractTranslationTestCase

[kenjis]

Description
Fix the following error.

 ------ -----------------------------------------------------------------------
  Line   tests/Language/AbstractTranslationTestCase.php
 ------ -----------------------------------------------------------------------
  327    Strict comparison using === between array{list<non-empty-string>} and
         array{} will always evaluate to false.
         💡 Because the type is coming from a PHPDoc, you can turn off this
            check by setting treatPhpDocTypesAsCertain: false in your
            phpstan.neon.dist.
 ------ -----------------------------------------------------------------------

https://github.com/codeigniter4/shield/actions/runs/10269040515/job/28413552557?pr=1152

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[datamweb]

It looks like we need to update the paths variable in phpunit-lang Github Actions by adding tests/Language/AbstractTranslationTestCase.php to see the changes applied.

[datamweb]

@kenjis thanks.