subtask of https://github.com/apache/incubator-hugegraph/issues/2265 - [x] drop support for java8: https://github.com/apache/incubator-hugegraph/pull/2498 - [ ] upgrade Hbase 2.3+ to use Java11 runtime & drop the Java8 in server's CI https://github.com/apache/incubator-hugegraph/blob/1228dec04d38735b6f8b69244740fbd62310c2de/.github/workflows/server-ci.yml#L48 - [x] `compiler.source/target` https://github.com/apache/incubator-hugegraph/pull/2574 - [ ] ...
subtask of #2265
pd-grpc&pd-common&pd-client#2498compiler.source/targetchore: minor improve for pom properties #2574