I noticed this when working on
#16697.

[PEP 639](https://peps.python.org/pep-0639/#add-license-files-key)
expects tools to ship license texts as UTF‑8, but previously `uv build`
would quietly include any binary blob listed under
`project.license-files`.

I have no clue what is going on with `rustfmt` for this file, but it
seems that when I add the check, it wants to reformat a bunch of
surrounding stuff.

The relevant part to look at is:

```rust
for license_file in &license_files {
    let file_path = root.join(license_file);
    let bytes = fs_err::read(&file_path)?;
    if str::from_utf8(&bytes).is_err() {
        return Err(ValidationError::LicenseFileNotUtf8(license_file.clone()).into());
    }
}
```

where we validate all collected license files before proceeding.

---------

Co-authored-by: konstin <[email protected]>

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [astral-sh/uv](https://github.com/astral-sh/uv) | patch | `0.9.9` -> `0.9.10` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>astral-sh/uv (astral-sh/uv)</summary>

### [`v0.9.10`](https://github.com/astral-sh/uv/blob/HEAD/CHANGELOG.md#0910)

[Compare Source](astral-sh/uv@0.9.9...0.9.10)

Released on 2025-11-17.

##### Enhancements

- Add support for `SSL_CERT_DIR` ([#&#8203;16473](astral-sh/uv#16473))
- Enforce UTF‑8-encoded license files during `uv build` ([#&#8203;16699](astral-sh/uv#16699))
- Error when a `project.license-files` glob matches nothing ([#&#8203;16697](astral-sh/uv#16697))
- `pip install --target` (and `sync`) install Python if necessary ([#&#8203;16694](astral-sh/uv#16694))
- Account for `python_downloads_json_url` in pre-release Python version warnings ([#&#8203;16737](astral-sh/uv#16737))
- Support HTTP/HTTPS URLs in `uv python --python-downloads-json-url` ([#&#8203;16542](astral-sh/uv#16542))

##### Preview features

- Add support for `--upgrade` in `uv python install` ([#&#8203;16676](astral-sh/uv#16676))
- Fix handling of `python install --default` for pre-release Python versions ([#&#8203;16706](astral-sh/uv#16706))
- Add `uv workspace list` to list workspace members ([#&#8203;16691](astral-sh/uv#16691))

##### Bug fixes

- Don't check file URLs for ambiguously parsed credentials ([#&#8203;16759](astral-sh/uv#16759))

##### Documentation

- Add a "storage" reference document ([#&#8203;15954](astral-sh/uv#15954))

</details>

---

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