Bump actions/cache from 4 to 5 (#2403) #1540

Job	Run time
Windows - PHP 8.1 & SQL Server	3m 0s
Coding Standard & Static Analysis	31s
testsuite (8.1, pgsql)	39s
testsuite (8.4, pgsql)	52s
testsuite (8.4, mysql)	1m 0s
testsuite (8.4, sqlite)	27s
testsuite (8.1, sqlite)	26s
testsuite (8.2, mysql)	1m 1s
testsuite (8.1, sqlite, prefer-lowest)	31s
testsuite (8.1, mysql)	40s
	9m 7s

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