composer(deps-dev): bump ergebnis/phpunit-slow-test-detector

Bumps [ergebnis/phpunit-slow-test-detector](https://github.com/ergebnis/phpunit-slow-test-detector) from 2.15.1 to 2.16.0.
- [Release notes](https://github.com/ergebnis/phpunit-slow-test-detector/releases)
- [Changelog](https://github.com/ergebnis/phpunit-slow-test-detector/blob/2.16.0/CHANGELOG.md)
- [Commits](ergebnis/phpunit-slow-test-detector@2.15.1...2.16.0)

---
updated-dependencies:
- dependency-name: ergebnis/phpunit-slow-test-detector
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

composer.json

@@ -104,7 +104,7 @@
     "require-dev": {
         "dama/doctrine-test-bundle": "^8.2",
         "ergebnis/composer-normalize": "^2.43",
-        "ergebnis/phpunit-slow-test-detector": "^2.15",
+        "ergebnis/phpunit-slow-test-detector": "^2.16",
         "phpstan/extension-installer": "^1.4",
         "phpstan/phpstan": "^1.12",
         "phpstan/phpstan-deprecation-rules": "^1.2",