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
```

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
```

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
```

https://build.opensuse.org/request/show/1297806
by user mia + dimstar_suse
- Update to 1.9.3
  * Add support for RISC-V architecture in manylinux
    gh#PyO3/maturin#2694
  * pyproject.toml: bump setuptools for PEP 639
    gh#PyO3/maturin#2698
  * Fix PEP 639 support for source distributions
    gh#PyO3/maturin#2704
  * Fix relative README rewrite in source distributions
    gh#PyO3/maturin#2705

- Update to 1.9.2
  * Respect PEP 621 dynamic fields when merging Cargo.toml metadata
    gh#PyO3/maturin#2672
  * Only use all_features=true in sdist when local path
    dependencies exist
    gh#PyO3/maturin#2674
  * auditwheel: add manylinux_2_26 policy
    gh#PyO3/maturin#2677
  * Use user-specified library search paths in RUSTFLAGS in
    auditwheel
    gh#PyO3/maturin#2676
  * pyproject.toml: add license-files
    gh#PyO3/maturin#2690
  * Update manylinux/musllinux