composer(deps-dev): bump rector/rector from 0.18.13 to 0.19.8 #384

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	14s
Dependency Analysis (8.1, locked)	16s
Coding Standards (8.1, locked)	13s
Code Coverage (8.1, locked)	14s
Mutation Tests (8.1, locked)	29s
Refactoring (8.1, locked)	15s
Static Code Analysis (8.1, locked)	2m 51s
Tests (8.1, lowest)	14s
Security Analysis (8.1, locked)	18s
Tests (8.1, locked)	27s
Tests (8.1, highest)	13s
Tests (8.2, lowest)	13s
Tests (8.2, locked)	24s
Tests (8.2, highest)	23s
Tests (8.3, lowest)	13s
Tests (8.3, locked)	14s
Tests (8.3, highest)	13s
	7m 24s

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