Update GitHub actions for wip/2.3 #181

Job	Run time
Run examples in 'session-example' on MySQL	57s
Test with MariaDB	25s
Run examples in 'session-example' on PostgreSQL	1m 0s
Test with Java 11	29s
Test with MySQL	27s
Run examples in 'native-sql-example' on PostgreSQL	58s
Test with Java 17	32s
Test with PostgreSQL	35s
Test with Java 20	42s
Test with MSSQLServer	26s
Test with CockroachDB	35s
Test with Java 21	34s
Test with Db2	27s
Test with Java 22	46s
Test with Oracle	28s
Test with Java 23-ea	1m 20s
Test with Java 24-ea	43s
	11m 24s

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