composer(deps-dev): Bump rector/rector from 0.18.13 to 0.19.8 #105

Job	Run time
Coding Standards (8.1, locked)	23s
Backward-Compatibility Analysis (8.1, locked)	15s
Code Coverage (8.1, locked)	1m 15s
Dependency Analysis (8.1, locked)	23s
Refactoring (8.1, locked)	13s
Mutation Tests (8.1, locked)	1m 20s
Security Analysis (8.1, locked)	12s
Static Code Analysis (8.1, locked)	2m 33s
Tests (8.1, lowest)	20s
Tests (8.1, locked)	20s
Tests (8.1, highest)	23s
Tests (8.2, lowest)	26s
Tests (8.2, locked)	18s
Tests (8.2, highest)	19s
Tests (8.3, lowest)	20s
Tests (8.3, locked)	21s
Tests (8.3, highest)	21s
	9m 42s

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