composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.8.0 to 2.9.0 #2647

Job	Run time
Coding Standards (8.1, locked)	16s
Backward-Compatibility Analysis (8.1, locked)	16s
Mutation Tests (8.1, locked)	20s
Code Coverage (8.1, locked)	20s
Refactoring (8.1, locked)	16s
Security Analysis (8.1, locked)	21s
Static Code Analysis (8.1, locked)	31s
Tests (8.1, lowest)	21s
Dependency Analysis (8.1, locked)	14s
Tests (8.1, locked)	20s
Tests (8.1, highest)	21s
Tests (8.2, lowest)	20s
Tests (8.2, locked)	25s
Tests (8.2, highest)	20s
Tests (8.3, lowest)	24s
Tests (8.3, locked)	20s
Tests (8.3, highest)	23s
	5m 48s

Provide feedback