composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.8.0 to 2.9.0 #503

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	19s
Code Coverage (8.1, locked)	27s
Coding Standards (8.1, locked)	23s
Dependency Analysis (8.1, locked)	31s
Mutation Tests (8.1, locked)	28s
Refactoring (8.1, locked)	28s
Security Analysis (8.1, locked)	31s
Static Code Analysis (8.1, locked)	41s
Tests (8.1, lowest)	18s
Tests (8.1, locked)	25s
Tests (8.1, highest)	19s
Tests (8.2, lowest)	27s
Tests (8.2, locked)	32s
Tests (8.2, highest)	31s
Tests (8.3, lowest)	22s
Tests (8.3, locked)	31s
Tests (8.3, highest)	29s
	7m 42s

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