composer(deps-dev): Bump roave/backward-compatibility-check from 8.4.0 to 8.6.0 #2305

Job	Run time
Coding Standards (8.1, locked)	28s
Backward-Compatibility Analysis (8.1, locked)	33s
Code Coverage (8.1, locked)	29s
Compile Phar (8.1, locked)	30s
Dependency Analysis (8.1, locked)	21s
Mutation Tests (8.1, locked)	2m 3s
Refactoring (8.1, locked)	25s
Security Analysis (8.1, locked)	23s
Static Code Analysis (8.1, locked)	34s
Tests (8.1, lowest)	24s
Tests (8.1, locked)	21s
Tests (8.1, highest)	27s
Tests (8.2, lowest)	26s
Tests (8.2, locked)	26s
Tests (8.2, highest)	25s
Tests (8.3, lowest)	19s
Tests (8.3, locked)	19s
Tests (8.3, highest)	21s
	9m 14s

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