composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.8.0 to 2.9.0 #1562

Job	Run time
Code Coverage (8.1, locked)	23s
Backward-Compatibility Analysis (8.1, locked)	17s
Coding Standards (8.1, locked)	23s
Dependency Analysis (8.1, locked)	21s
Refactoring (8.1, locked)	24s
Mutation Tests (8.1, locked)	33s
Security Analysis (8.1, locked)	14s
Static Code Analysis (8.1, locked)	30s
Tests (8.1, lowest)	25s
Tests (8.1, locked)	17s
Tests (8.1, highest)	18s
Tests (8.2, lowest)	24s
Tests (8.2, locked)	19s
Tests (8.2, highest)	22s
Tests (8.3, lowest)	19s
Tests (8.3, locked)	20s
Tests (8.3, highest)	23s
	6m 12s

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