#2694)

Recently, pypi has just provided support for riscv wheel uploads. For
details, please see pypi/warehouse#18390

Here you can see that test.pypi.org has deployed support,
https://github.com/pypi/warehouse/deployments/test.pypi.org

I think maturin-action can also provide support for this, mainly by
setting manylinux_2_39 as the default and supported version of riscv64,
so that riscv64 packages that can be uploaded to pypi can be packaged

Here are the results of my github action run, 

CI result:
[release](https://github.com/ffgan/maturin/actions/runs/16551719275)
[test](https://github.com/ffgan/maturin/actions/runs/16551720338)



The results show that riscv64 runs well


**Other Info**

Co-authored-by: @kotvaer
Co-authored-by: nijincheng@iscas.ac.cn；

---------

Co-authored-by: messense <messense@icloud.com>

Make sure we use setuptools 77.0.0 or newer, which ensures PEP 639
support. This should've been bumped along with the changes in 7402a48,
otherwise the user can run into errors like the following:

|ValueError: invalid pyproject.toml config: `project.license`.
| configuration error: `project.license` must be valid exactly by one
definition (2 matches found):
|        - keys:
|            'file': {type: string}
|          required: ['file']
|        - keys:
|            'text': {type: string}
|          required: ['text']
|    ERROR Backend subprocess exited when trying to invoke build_wheel

See also #2690.

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

<!--pre-commit.ci start-->
updates:
- [github.com/astral-sh/ruff-pre-commit: v0.12.4 →
v0.12.5](astral-sh/ruff-pre-commit@v0.12.4...v0.12.5)
<!--pre-commit.ci end-->

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

We were previously missing license files in source distributions.

Previously building the hello-world example crate through a source
distribution would fail.

Test plan (after #2704):

```
cd test-crates/hello-world
maturin build --sdist
uv build --wheel target/wheels/hello_world-0.1.0.tar.gz
```