Add JDK 26-ea to the build #4690

Job	Run time
Test with Java 20	3m 17s
Test with MySQL	4m 30s
Test with Java 17	3m 34s
Test with Java 25-ea	3m 42s
Run examples in 'session-example' on PostgreSQL	1m 58s
Test with PostgreSQL	3m 39s
Test with MariaDB	3m 56s
Test with Java 21	3m 23s
Test with Java 26-ea	3m 27s
Test with Java 24	3m 32s
Run examples in 'session-example' on MySQL	2m 6s
Run examples in 'native-sql-example' on PostgreSQL	2m 0s
Test with MSSQLServer	4m 2s
Test with CockroachDB	5m 56s
Test with Db2	5m 32s
Test with Oracle	5m 20s
	59m 54s

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