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

Bumps [ergebnis/phpunit-slow-test-detector](https://github.com/ergebnis/phpunit-slow-test-detector) from 2.19.1 to 2.20.0.
- [Release notes](https://github.com/ergebnis/phpunit-slow-test-detector/releases)
- [Changelog](https://github.com/ergebnis/phpunit-slow-test-detector/blob/main/CHANGELOG.md)
- [Commits](ergebnis/phpunit-slow-test-detector@2.19.1...2.20.0)

---
updated-dependencies:
- dependency-name: ergebnis/phpunit-slow-test-detector
  dependency-version: 2.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

composer.json

@@ -53,7 +53,7 @@
     "ergebnis/factory-bot": "^1.9.0",
     "ergebnis/license": "^2.6.0",
     "ergebnis/php-cs-fixer-config": "^6.53.0",
-    "ergebnis/phpunit-slow-test-detector": "^2.19.1",
+    "ergebnis/phpunit-slow-test-detector": "^2.20.0",
     "infection/infection": "~0.27.11",
     "phpunit/phpunit": "^10.5.26",
     "psalm/plugin-phpunit": "~0.19.0",