Update documentation about the default JDK version to Java11
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Description
### Search before asking
- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.
### Description
We have merged https://github.com/apache/fluss/issues/1195 which upgrade the default compile version to Java 11. We need to update our documentation https://fluss.apache.org/community/dev/building/ about this change, and also describe how to compile against Java8 using `-Pjava8` profile.
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- [ ] I'm willing to submit a PR!
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