Update the project's Junit and GraalVM Native Build Tools versions to 5.9.2 and 0.9.20

[linghengqian]

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• Yes, refer to Add support for com.baomidou:dynamic-datasource-spring-boot-starter:3.6.1 #154 and Add support for io.etcd:jetcd-core:0.7.5 #170 .

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• Since Spring Boot 3.0.1 requires a GraalVM Native Build Tools version >= 0.9.18, this prevents me from continuing to investigate Add support for com.baomidou:dynamic-datasource-spring-boot-starter:3.6.1 #154. I think it's reasonable to raise the version.
  Some unreasonable behavior related to Junit was found in Add support for io.etcd:jetcd-core:0.7.5 #170, I think we should increase the project Junit version.
• Update the project's Junit and GraalVM Native Build Tools versions.

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• Null.

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• Some early investigations from Some plan to write additional unit tests for the class library need GraalVM Reachability Metadata linghengqian/graalvm-trace-metadata-smoketest#1 and Make ShardingSphere Proxy in GraalVM Native Image form available apache/shardingsphere#21347 .

[linghengqian]

• I think it would be better to deal with this issue after most of the PR has been dealt with, to avoid introducing unknowns.

[linghengqian]

• I'm working on this issue.