Fix compatibility to PHPUnit 9

composer.json

@@ -28,6 +28,9 @@
         "openlss/lib-array2xml": "^1.0",
         "symfony/expression-language": "^2.3|^3.0|^4.0|^5.0|^6.0"
     },
+    "conflict": {
+        "phpunit/phpunit": ">=11.0"
+    },
     "suggest": {
         "openlss/lib-array2xml": "In order ot use Coduo\\PHPMatcher\\Matcher\\XmlMatcher",
         "symfony/expression-language" : "In order to use Coduo\\PHPMatcher\\Matcher\\ExpressionMatcher"

src/PHPUnit/PHPMatcherConstraint.php

@@ -39,7 +39,7 @@ public function toString() : string
         return 'matches given pattern.';
     }
 
-    protected function failureDescription(mixed $other) : string
+    protected function failureDescription($other) : string
     {
         $errorDescription = $this->matcher->error() ?: 'Value does not match given pattern';
         $backtrace = $this->matcher->backtrace();
@@ -50,20 +50,20 @@ protected function failureDescription(mixed $other) : string
                 . "\nBacktrace:\n" . $this->matcher->backtrace();
     }
 
-    protected function matches(mixed $other) : bool
+    protected function matches($other) : bool
     {
         return $this->matcher->match($other, $this->pattern);
     }
 
     /**
      * {@inheritdoc}
      */
-    protected function fail(mixed $other, string $description, ComparisonFailure $comparisonFailure = null) : never
+    protected function fail($other, $description, ComparisonFailure $comparisonFailure = null) : never
     {
         parent::fail($other, $description, $comparisonFailure ?? $this->createComparisonFailure($other));
     }
 
-    private function createComparisonFailure(mixed $other) : ?ComparisonFailure
+    private function createComparisonFailure($other) : ?ComparisonFailure
     {
         if (!\is_string($other) || !\is_string($this->pattern) || !\class_exists(Json::class)) {
             return null;