composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.15.1 to 2.16.0 #1066

Job	Run time
Code Coverage (8.1, locked)	14s
Backward-Compatibility Analysis (8.1, locked)	14s
Coding Standards (8.1, locked)	15s
Dependency Analysis (8.1, locked)	17s
Mutation Tests (8.1, locked)	18s
Refactoring (8.1, locked)	13s
Security Analysis (8.1, locked)	12s
Static Code Analysis (8.1, locked)	30s
Tests (8.1, lowest)	13s
Tests (8.1, locked)	12s
Tests (8.1, highest)	14s
Tests (8.2, lowest)	14s
Tests (8.2, locked)	13s
Tests (8.2, highest)	16s
Tests (8.3, lowest)	13s
Tests (8.3, locked)	17s
Tests (8.3, highest)	23s
	4m 28s

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