Unpin version of slevomat/coding-standard (#2361) #1415

Job	Run time
testsuite (8.4, pgsql)	49s
Coding Standard & Static Analysis	35s
Windows - PHP 8.1 & SQL Server	3m 38s
testsuite (8.4, mysql)	58s
testsuite (8.4, sqlite)	35s
testsuite (8.1, mysql)	43s
testsuite (8.1, sqlite, prefer-lowest)	31s
testsuite (8.1, pgsql)	47s
testsuite (8.2, mysql)	1m 11s
testsuite (8.1, sqlite)	32s
	10m 19s

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