Pom generation should use latest released versions of dependencies

### Clear and concise description of the problem

When generating `pom.xml`, dependencies like `azure-core`, `azure-core-http-netty`, `io.clientcore:core` and similar packages have fixed dependency versions today. The generator should pull the latest available version for these libraries from Maven Central and generate the pom with those versions.

### Checklist

- [x] Follow our [Code of Conduct](https://github.com/microsoft/typespec/blob/main/CODE_OF_CONDUCT.md)
- [x] Read the [docs](https://typespec.io/docs/).
- [x] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.