composer(deps-dev): Bump ergebnis/php-cs-fixer-config from 6.14.0 to 6.15.0 #2312

Job	Run time
Coding Standards (8.1, locked)	24s
Code Coverage (8.1, locked)	45s
Backward-Compatibility Analysis (8.1, locked)	29s
Compile Phar (8.1, locked)	16s
Dependency Analysis (8.1, locked)	13s
Mutation Tests (8.1, locked)	2m 4s
Refactoring (8.1, locked)	15s
Security Analysis (8.1, locked)	16s
Tests (8.1, lowest)	43s
Static Code Analysis (8.1, locked)	26s
Tests (8.1, locked)	31s
Tests (8.1, highest)	33s
Tests (8.2, lowest)	32s
Tests (8.2, locked)	31s
Tests (8.2, highest)	33s
Tests (8.3, lowest)	29s
Tests (8.3, locked)	32s
Tests (8.3, highest)	25s
	9m 57s

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