setup.cfg: remove "Source" and "Tracker" project URLs

Now when we use Trusted Publishing
(https://docs.pypi.org/trusted-publishers/), PyPI automatically adds a
section "GitHub Statistics" about the GitHub source repo, as you can see
at https://test.pypi.org/project/kaitaistruct/0.11.dev2/:

> ##### Project links
>
> - [Source](https://github.com/kaitai-io/kaitai_struct_python_runtime)
> - [Tracker](https://github.com/kaitai-io/kaitai_struct_python_runtime/issues)
>
> ##### GitHub Statistics
>
> - [Repository](https://github.com/kaitai-io/kaitai_struct_python_runtime)
> - [Stars: 99](https://github.com/kaitai-io/kaitai_struct_python_runtime/stargazers)
> - [Forks: 32](https://github.com/kaitai-io/kaitai_struct_python_runtime/network/members)
> - [Open issues: 7](https://github.com/kaitai-io/kaitai_struct_python_runtime/issues)
> - [Open PRs: 5](https://github.com/kaitai-io/kaitai_struct_python_runtime/pulls)

Therefore, our own "Project links" seem redundant.

Author: generalmimon

setup.cfg

@@ -6,8 +6,6 @@ author_email = [email protected]
 url = https://kaitai.io
 project_urls =
     Documentation = https://doc.kaitai.io/
-    Source = https://github.com/kaitai-io/kaitai_struct_python_runtime
-    Tracker = https://github.com/kaitai-io/kaitai_struct_python_runtime/issues
     Gitter = https://gitter.im/kaitai_struct/Lobby
 description = Kaitai Struct declarative parser generator for binary data: runtime library for Python
 long_description = file: README.md