composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.8.0 to 2.9.0 #1364

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	15s
Code Coverage (8.1, locked)	23s
Coding Standards (8.1, locked)	15s
Dependency Analysis (8.1, locked)	19s
Refactoring (8.1, locked)	22s
Mutation Tests (8.1, locked)	19s
Security Analysis (8.1, locked)	19s
Static Code Analysis (8.1, locked)	31s
Tests (8.1, lowest)	19s
Tests (8.1, locked)	20s
Tests (8.1, highest)	34s
Tests (8.2, lowest)	20s
Tests (8.2, locked)	18s
Tests (8.2, highest)	19s
Tests (8.3, lowest)	16s
Tests (8.3, locked)	16s
Tests (8.3, highest)	17s
	5m 42s

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