Bump dto to v3 #2281

Job	Run time
Coding Standard & Static Analysis	43s
testsuite (8.5, mysql)	56s
testsuite (8.5, sqlite)	31s
testsuite (8.2, pgsql)	50s
testsuite (8.2, sqlite, prefer-lowest)	33s
testsuite (8.5, pgsql)	45s
testsuite (8.2, mysql)	54s
testsuite (8.2, sqlite)	33s
	5m 45s

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