composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.15.0 to 2.15.1 #3994

Job	Run time
Coding Standards (8.1, locked)	22s
Code Coverage (8.1, locked)	20s
Dependency Analysis (8.1, locked)	30s
Backward-Compatibility Analysis (8.1, locked)	29s
Mutation Tests (8.1, locked)	48s
Refactoring (8.1, locked)	22s
Security Analysis (8.1, locked)	20s
Static Code Analysis (8.1, locked)	41s
Tests (8.1, lowest)	25s
Tests (8.1, locked)	26s
Tests (8.1, highest)	23s
Tests (8.2, lowest)	26s
Tests (8.2, locked)	18s
Tests (8.2, highest)	20s
Tests (8.3, lowest)	18s
Tests (8.3, locked)	18s
Tests (8.3, highest)	25s
	7m 11s

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