composer(deps-dev): Bump ergebnis/phpunit-slow-test-detector from 2.7.0 to 2.8.0 #2645

Job	Run time
Coding Standards (8.1, locked)	16s
Code Coverage (8.1, locked)	24s
Dependency Analysis (8.1, locked)	19s
Backward-Compatibility Analysis (8.1, locked)	15s
Mutation Tests (8.1, locked)	20s
Refactoring (8.1, locked)	16s
Security Analysis (8.1, locked)	21s
Static Code Analysis (8.1, locked)	34s
Tests (8.1, lowest)	22s
Tests (8.1, locked)	13s
Tests (8.1, highest)	21s
Tests (8.2, lowest)	23s
Tests (8.2, locked)	28s
Tests (8.2, highest)	19s
Tests (8.3, lowest)	16s
Tests (8.3, locked)	17s
Tests (8.3, highest)	15s
	5m 39s

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