Update nette/tester requirement from 2.5.0 to 2.5.1

Updates the requirements on [nette/tester](https://github.com/nette/tester) to permit the latest version.
- [Release notes](https://github.com/nette/tester/releases)
- [Commits](nette/tester@v2.5.0...v2.5.1)

---
updated-dependencies:
- dependency-name: nette/tester
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -20,7 +20,7 @@
         "texy/texy": "^3.1.6@dev"
     },
     "require-dev": {
-        "nette/tester": "2.5.0",
+        "nette/tester": "2.5.1",
         "phpstan/phpstan": "1.10.26",
         "phpstan/phpstan-strict-rules": "1.5.1",
         "phpstan/phpstan-nette": "1.2.9",