composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.15.0 to 2.15.1 #3988

Job	Run time
Code Coverage (8.1, locked)	20s
Coding Standards (8.1, locked)	21s
Backward-Compatibility Analysis (8.1, locked)	21s
Dependency Analysis (8.1, locked)	22s
Mutation Tests (8.1, locked)	45s
Refactoring (8.1, locked)	20s
Security Analysis (8.1, locked)	21s
Static Code Analysis (8.1, locked)	36s
Tests (8.1, lowest)	30s
Tests (8.1, locked)	17s
Tests (8.1, highest)	32s
Tests (8.2, lowest)	23s
Tests (8.2, locked)	23s
Tests (8.2, highest)	26s
Tests (8.3, lowest)	25s
Tests (8.3, locked)	17s
Tests (8.3, highest)	19s
	6m 58s

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