composer(deps-dev): Bump roave/backward-compatibility-check from 8.4.0 to 8.6.0 #496

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	19s
Code Coverage (8.1, locked)	21s
Coding Standards (8.1, locked)	14s
Dependency Analysis (8.1, locked)	14s
Mutation Tests (8.1, locked)	20s
Refactoring (8.1, locked)	25s
Security Analysis (8.1, locked)	21s
Static Code Analysis (8.1, locked)	25s
Tests (8.1, lowest)	20s
Tests (8.1, locked)	24s
Tests (8.1, highest)	19s
Tests (8.2, lowest)	19s
Tests (8.2, locked)	18s
Tests (8.2, highest)	31s
Tests (8.3, lowest)	17s
Tests (8.3, locked)	15s
Tests (8.3, highest)	24s
	5m 46s

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