Fix message matching in RepeatTest::testNegativeRepeatedtimes

PHP 8.4 has changed the format of __FUNCTION__ for closures, at least.

tests/Functional/RepeatTest.php

@@ -45,8 +45,13 @@ public function test(): void
     public function testNegativeRepeatedTimes(): void
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage(
-            'Functional\{closure}() expects parameter 1 to be positive integer, negative integer given'
+
+        // See https://3v4l.org/Ms79G for message formats
+        // See https://regex101.com/r/hTvW3o/1 for regex setup
+        $this->expectExceptionMessageMatches(
+            '/(Functional\\\\{closure}' // PHP < 8.4
+                . '|{closure:Functional\\\\repeat\(\):[0-9]+})' // PHP 8.4+
+                . '\(\) expects parameter 1 to be positive integer, negative integer given/'
         );
 
         repeat([$this->repeated, 'foo'])(-1);