composer(deps-dev): bump ergebnis/phpunit-slow-test-detector from 2.14.0 to 2.15.0 #1755

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	18s
Code Coverage (8.1, locked)	18s
Coding Standards (8.1, locked)	24s
Dependency Analysis (8.1, locked)	18s
Mutation Tests (8.1, locked)	39s
Refactoring (8.1, locked)	22s
Security Analysis (8.1, locked)	19s
Static Code Analysis (8.1, locked)	26s
Tests (8.1, lowest)	50s
Tests (8.1, locked)	15s
Tests (8.1, highest)	23s
Tests (8.2, lowest)	34s
Tests (8.2, locked)	35s
Tests (8.2, highest)	34s
Tests (8.3, lowest)	22s
Tests (8.3, locked)	16s
Tests (8.3, highest)	27s
	7m 20s

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