Update dependency wyrihaximus/test-utilities to v8

Author: mammatusphp-renovate-runner[bot]

composer.json

@@ -7,7 +7,7 @@
         "mammatus/kubernetes-contracts": "^1"
     },
     "require-dev": {
-        "wyrihaximus/test-utilities": "^5.6"
+        "wyrihaximus/test-utilities": "^8.5.0"
     },
     "autoload": {
         "psr-4": {