composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.7.0 to 2.8.0 #500

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	25s
Dependency Analysis (8.1, locked)	22s
Coding Standards (8.1, locked)	21s
Code Coverage (8.1, locked)	24s
Mutation Tests (8.1, locked)	20s
Refactoring (8.1, locked)	23s
Security Analysis (8.1, locked)	25s
Static Code Analysis (8.1, locked)	27s
Tests (8.1, lowest)	18s
Tests (8.1, locked)	19s
Tests (8.1, highest)	24s
Tests (8.2, lowest)	29s
Tests (8.2, locked)	23s
Tests (8.2, highest)	21s
Tests (8.3, lowest)	27s
Tests (8.3, locked)	20s
Tests (8.3, highest)	20s
	6m 28s

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