test: fix incorrect condition

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  Line   tests/Language/AbstractTranslationTestCase.php
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  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.
 ------ -----------------------------------------------------------------------

Author: kenjis

tests/Language/AbstractTranslationTestCase.php

@@ -324,7 +324,7 @@ final public function testAllLocalizationParametersAreNotTranslated(string $loca
                 preg_match_all('/(\{[^\}]+\})/', $translation, $matches);
                 array_shift($matches);
 
-                if ($matches === []) {
+                if ($matches === [[]]) {
                     unset($matches);
 
                     continue;