Update phpstan to 2.1.x #1470

Job	Run time
Windows - PHP 8.1 & SQL Server	2m 43s
Coding Standard & Static Analysis	32s
testsuite (8.1, sqlite)	31s
testsuite (8.1, mysql)	45s
testsuite (8.4, sqlite)	29s
testsuite (8.4, mysql)	1m 6s
testsuite (8.1, sqlite, prefer-lowest)	36s
testsuite (8.2, mysql)	59s
testsuite (8.1, pgsql)	49s
testsuite (8.4, pgsql)	1m 10s
	9m 40s

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