fix error with change in slevomat/coding-standard 8.19.0 #224

Job	Run time
Coding Standard & Static Analysis	18s
testsuite (8.0, true)	19s
testsuite (7.2, lowest)	14s
testsuite (7.4, highest, false)	18s
testsuite (7.2, highest, false)	21s
testsuite (8.0, highest, false)	16s
	1m 46s

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