composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.14.0 to 2.15.0 #1820

Job	Run time
Code Coverage (8.1, locked)	15s
Dependency Analysis (8.1, locked)	24s
Coding Standards (8.1, locked)	14s
Backward-Compatibility Analysis (8.1, locked)	13s
Refactoring (8.1, locked)	15s
Security Analysis (8.1, locked)	17s
Static Code Analysis (8.1, locked)	27s
Tests (8.1, lowest)	26s
Tests (8.1, locked)	12s
Tests (8.1, highest)	17s
Tests (8.2, lowest)	28s
Tests (8.2, locked)	19s
Tests (8.2, highest)	29s
Tests (8.3, lowest)	18s
Tests (8.3, locked)	15s
Tests (8.3, highest)	31s
	5m 20s

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