Update nette/tester requirement from 2.5.2 to 2.5.3

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@v2.5.2...v2.5.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -21,7 +21,7 @@
         "nette/utils": "^3.2@dev || ^4.0@dev"
     },
     "require-dev": {
-        "nette/tester": "2.5.2",
+        "nette/tester": "2.5.3",
         "mockery/mockery": "1.6.12",
         "phpstan/phpstan": "1.11.3",
         "phpstan/phpstan-strict-rules": "1.6.0",