This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [astral-sh/uv](https://github.com/astral-sh/uv) | patch | `0.5.30` -> `0.5.31` |

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>

### [`v0.5.31`](https://github.com/astral-sh/uv/blob/HEAD/CHANGELOG.md#0531)

[Compare Source](astral-sh/uv@0.5.30...0.5.31)

##### Enhancements

-   Add `uv sync --script` ([#&#8203;11361](astral-sh/uv#11361))
-   Allow PEP 508 requirements in tool requests ([#&#8203;11337](astral-sh/uv#11337))
-   Allow source distributions to produce wheels with `+local` suffixes ([#&#8203;11429](astral-sh/uv#11429))
-   Bring parity to `uvx` and `uv tool install` requests ([#&#8203;11345](astral-sh/uv#11345))
-   Use a stable directory for local, remote, and stdin script virtual environments ([#&#8203;11347](astral-sh/uv#11347), [#&#8203;11364](astral-sh/uv#11364))
-   Detect infinite recursion in `uv run` ([#&#8203;11386](astral-sh/uv#11386))

##### Python

The managed Python distributions have been updated, including:

-   CPython 3.14.0a5, which includes a new [tail calling interpreter](https://docs.python.org/3.14/whatsnew/3.14.html#whatsnew314-tail-call) for a significant performance improvement
-   The bundled OpenSSL version was updated from 3.0.15 to 3.0.16 which fixes a [security advisory](https://openssl-library.org/news/secadv/20241016.txt)

See the [`python-build-standalone` release notes](https://github.com/astral-sh/python-build-standalone/releases/tag/20250212) for more details.

##### Bug fixes

-   Fix cross-drive script installation ([#&#8203;11167](astral-sh/uv#11167))
-   Add indexes in priority order ([#&#8203;11451](astral-sh/uv#11451))
-   Allow `--python <dir>` requests to match existing environments if `sys.executable` is the same file ([#&#8203;11290](astral-sh/uv#11290))
-   Avoid comparing to system site packages in `--dry-run` mode ([#&#8203;11427](astral-sh/uv#11427))
-   Prefer running executables in the environment with `<name>` over `<name>/__main__.py` ([#&#8203;11431](astral-sh/uv#11431))
-   Retry local clones without hardlinks if they fail ([#&#8203;11421](astral-sh/uv#11421))

##### Documentation

-   Update alternative-indexes.md to use `UV_INDEX` instead of `UV_EXTRA_INDEX_URL` ([#&#8203;11381](astral-sh/uv#11381))
-   Update scripts guide to include using package indexes ([#&#8203;11443](astral-sh/uv#11443))

</details>

---

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## Summary

This PR refactors the whole `Target` abstraction, mostly to remove all
the repeated `From*` variants and logic in favor of a higher-level
struct that captures those details separately.

In doing so, it also adds support to `uvx` for unnamed requirements, for
parity with `uv tool install`. So, e.g., the following will show the
`flask` version:

```
uvx git+https://github.com/pallets/flask --version
```

I think this makes sense conceptually since we already support arbitrary
named requirements there.