Update dependency phpunit/phpunit to v13

Author: renovate[bot]

composer.json

@@ -25,7 +25,7 @@
     "psr/simple-cache": "~1.0 || ~2.0 || ~3.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "~6.0 || ~7.0 || ~9.0",
+    "phpunit/phpunit": "~6.0 || ~7.0 || ~9.0 || ~13.0",
     "phpstan/phpstan": "^1.12",
     "predis/predis": "^1.1 || ^2.0 || ^3.0",
     "symfony/var-exporter": "^5.4 || ^6.0 || ^7.0"