Fixed PHPStan (#7370)

* Fixed PHPStan

* Update RunTestsInCoroutine.php

Author: limingxinleo

src/Str.php

@@ -112,13 +112,12 @@ public static function apa($value)
                 $hyphenatedWords = explode('-', $lowercaseWord);
 
                 $hyphenatedWords = array_map(function ($part) use ($minorWords) {
-                    return (in_array($part, $minorWords) && mb_strlen($part) <= 3) ? $part : ucfirst($part);
+                    return (in_array($part, $minorWords)) ? $part : ucfirst($part);
                 }, $hyphenatedWords);
 
                 $words[$i] = implode('-', $hyphenatedWords);
             } else {
                 if (in_array($lowercaseWord, $minorWords)
-                    && mb_strlen($lowercaseWord) <= 3
                     && ! ($i === 0 || in_array(mb_substr($words[$i - 1], -1), $endPunctuation))) {
                     $words[$i] = $lowercaseWord;
                 } else {