Bump actions/checkout from 4 to 5 (#2372) #1437

Job	Run time
Coding Standard & Static Analysis	30s
testsuite (8.1, mysql)	43s
testsuite (8.1, sqlite)	32s
Windows - PHP 8.1 & SQL Server	2m 43s
testsuite (8.1, pgsql)	42s
testsuite (8.4, sqlite)	35s
testsuite (8.4, mysql)	57s
testsuite (8.2, mysql)	1m 3s
testsuite (8.4, pgsql)	50s
testsuite (8.1, sqlite, prefer-lowest)	32s
	9m 7s

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