composer(deps-dev): Bump roave/backward-compatibility-check from 8.4.0 to 8.6.0 #1315

Job	Run time
Backward-Compatibility Analysis (8.1, locked)	19s
Code Coverage (8.1, locked)	27s
Coding Standards (8.1, locked)	17s
Dependency Analysis (8.1, locked)	21s
Mutation Tests (8.1, locked)	29s
Refactoring (8.1, locked)	23s
Security Analysis (8.1, locked)	19s
Static Code Analysis (8.1, locked)	36s
Tests (8.1, lowest)	19s
Tests (8.1, locked)	19s
Tests (8.1, highest)	31s
Tests (8.2, lowest)	24s
Tests (8.2, locked)	32s
Tests (8.2, highest)	29s
Tests (8.3, lowest)	23s
Tests (8.3, locked)	16s
Tests (8.3, highest)	24s
	6m 48s

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