Change the JDK runtime of the Dockerfile that builds ShardingSphere Proxy from JDK17 to JDK21

[linghengqian]

Feature Request

For English only, other languages will not be accepted.

Please pay attention on issues you submitted, because we maybe need more details.
If no response anymore and we cannot make decision by current information, we will close it.

Please answer these questions before submitting your issue. Thanks!

Is your feature request related to a problem?

• Boost ShardingSphere Proxy by Vert.x #13957
• Exploration of ShardingSphere's base support for R2DBC SPI 1.0.0.RELEASE #19703

Describe the feature you would like.

• In response to Boost ShardingSphere Proxy by Vert.x #13957 and Exploration of ShardingSphere's base support for R2DBC SPI 1.0.0.RELEASE #19703, I'm looking forward to changing the JDK runtime for the Dockerfile that builds ShardingSphere Proxy from JDK17 to JDK21 . Once we achieve this goal, we will be able to introduce third-party jars and algorithm implementation classes using the Virtual Thread API to the Proxy's ext-lib folder.
• As of Support for building with OpenJDK 21 #28326, ShardingSphere already allows building via JDK21. As of Updates the minimum GraalVM CE version for compiling ShardingSphere's Native Image products to JDK 21.0.2 #29764, ShardingSphere Proxy Native is now buildable with GraalVM For JDK21. The current issue seems to be a natural one.