composer(deps-dev): bump ergebnis/phpunit-slow-test-detector from 2.15.1 to 2.16.0 #1617

Job	Run time
Dependency Analysis (8.1, locked)	17s
Code Coverage (8.1, locked)	15s
Mutation Tests (8.1, locked)	20s
Backward-Compatibility Analysis (8.1, locked)	14s
Coding Standards (8.1, locked)	14s
Refactoring (8.1, locked)	13s
Security Analysis (8.1, locked)	15s
Static Code Analysis (8.1, locked)	25s
Tests (8.1, lowest)	14s
Tests (8.1, locked)	13s
Tests (8.1, highest)	21s
Tests (8.2, lowest)	23s
Tests (8.2, locked)	20s
Tests (8.2, highest)	22s
Tests (8.3, lowest)	15s
Tests (8.3, locked)	15s
Tests (8.3, highest)	23s
	4m 59s

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