Update dependency ergebnis/phpunit-slow-test-detector to ^2.16.0

Author: renovate[bot]

composer.json

@@ -12,7 +12,7 @@
     "php": "^8.3",
     "ecoapm/libyear": "^2.3",
     "ergebnis/composer-normalize": "^2.43.0",
-    "ergebnis/phpunit-slow-test-detector": "^2.15.1",
+    "ergebnis/phpunit-slow-test-detector": "^2.16.0",
     "icanhazstring/composer-unused": "^0.8.11",
     "infection/infection": "^0.27.0",
     "maglnet/composer-require-checker": "^4.12.0",