Upgrade PhpUnit

To a version which is aware that Php8.4 deprecates E_STRICT.

Author: oleibman

composer.lock

@@ -17,11 +17,6 @@
 use PhpOffice\PhpSpreadsheet\Writer\Xlsx as XlsxWriter;
 use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
 
-/**
- * Seems to need to be separate for Php8.4 PhpUnit9 combination.
- *
- * @runTestsInSeparateProcesses
- */
 class ChartsDynamicTitleTest extends AbstractFunctional
 {
     protected function tearDown(): void

tests/PhpSpreadsheetTests/Chart/ChartsDynamicTitleTest.php

@@ -35,7 +35,7 @@ function phpunit10ErrorHandler(int $errno, string $errstr, string $filename, int
     return false; // continue error handling
 }
 
-if (!method_exists(PHPUnit\Framework\TestCase::class, 'setOutputCallback') || PHP_VERSION_ID >= 80400) {
+if (!method_exists(PHPUnit\Framework\TestCase::class, 'setOutputCallback')) {
     ini_set('error_reporting', (string) E_ALL);
     set_error_handler('phpunit10ErrorHandler');
 }