composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.14.0 to 2.15.0 #540

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	19s
Code Coverage (8.1, locked)	16s
Dependency Analysis (8.1, locked)	27s
Coding Standards (8.1, locked)	17s
Mutation Tests (8.1, locked)	19s
Refactoring (8.1, locked)	17s
Security Analysis (8.1, locked)	24s
Tests (8.1, lowest)	32s
Static Code Analysis (8.1, locked)	29s
Tests (8.1, locked)	17s
Tests (8.1, highest)	18s
Tests (8.2, lowest)	27s
Tests (8.2, locked)	19s
Tests (8.2, highest)	37s
Tests (8.3, lowest)	25s
Tests (8.3, locked)	16s
Tests (8.3, highest)	23s
	6m 22s

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