Change the minimum JDK version for compiling the project from JDK 11 to JDK 21

## Feature Request

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### Is your feature request related to a problem?

- See https://github.com/apache/shardingsphere/issues/26041 and https://github.com/apache/shardingsphere/issues/35052 .

### Describe the feature you would like.

- I want to change the minimum JDK version for compiling projects from JDK 11 to JDK 21. There has been more than one issue exposing the drawbacks of using JDK 11.
  -  The solution to https://github.com/apache/shardingsphere/issues/26041 requires using `org.eclipse.transformer:transformer-maven-plugin:1.0.0`, which only supports JDK 17+.
  - All integration tests related to HiveServer2 are locked to `apache/hive:4.0.1` because the minimum JDK runtime for `HiveServer2 JDBC Driver 4.1.0` is JDK 17, and the minimum JDK runtime for `HiveServer2 JDBC Driver 4.2.0` is JDK 21. The minimum JDK runtime for `HiveServer2 JDBC Driver 4.3.0-SNAPSHOT` will be changed to JDK 25 in the next few months. See https://lists.apache.org/thread/033sb2n0pmy333szs2qbgpndznnnfr9v . If we continue to use an older version of the HiveServer2 JDBC Driver in our integration tests, we will be unable to test local transaction support for HiveServer2 on Iceberg v4 tables. It's only a matter of time before https://github.com/apache/iceberg/pull/6948 is merged.

- The current issue does not require changes to runtime requirements, only compile-time requirements. Unit tests will still run on JDK 8, and artifacts published to the Maven Central Repository will still run on JDK 8. This means that email threads like https://lists.apache.org/thread/kgtfx5vnw73o61lkvdshyfvjfvvzk3js are unnecessary.
- It is not possible to use JDK25 for all modules at the moment. `org.apache.shardingsphere:shardingsphere-test-native` still depends on GraalVM CE for JDK 24. This matter is related to a bug in OpenJDK. See https://github.com/openjdk/jdk/pull/22606 .

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