Upgrade Gradle Wrapper to 8.12 #4218

Job	Run time
Run examples in 'session-example' on MySQL	1m 48s
Test with MariaDB	3m 36s
Run examples in 'session-example' on PostgreSQL	1m 51s
Test with MySQL	4m 15s
Test with Java 17	3m 28s
Test with Java 20	3m 33s
Test with PostgreSQL	3m 24s
Run examples in 'native-sql-example' on PostgreSQL	1m 49s
Test with Java 21	3m 32s
Test with MSSQLServer	4m 3s
Test with Java 23	3m 24s
Test with CockroachDB	6m 22s
Test with Java 24-ea	3m 31s
Test with Db2	5m 42s
Test with Java 25-ea	3m 30s
Test with Oracle	5m 4s
	58m 52s

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