tests: fix deprecation from PHPUnit

Chris8934 · Chris53897 · commit 44cec071fae9 · 2024-09-26T17:18:50.000+02:00
diff --git a/composer.json b/composer.json
@@ -41,7 +41,7 @@
         "phpstan/extension-installer": "^1.3",
         "phpstan/phpstan": "^1.10",
         "phpstan/phpstan-phpunit": "^1.3",
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^9.6.17",
         "symfony/http-client": "^5.4 || ^6.4 || ^7.0",
         "symfony/stopwatch": "^5.4 || ^6.4 || ^7.0"
     },
