Fix display name for `uvx --version` (#13109)
Based on #13108 because I don't want to deal with rebasing conflicts
across `main` and `release/070`.
```
❯ .uvx --version
uv-tool-uvx 0.6.16+23 (33b8b7340 2025-04-25)
❯ uvx --version
uvx 0.6.16+23 (33b8b7340 2025-04-25)
```
For posterity, chased this down via
https://github.com/clap-rs/clap/pull/3693 and
https://github.com/clap-rs/clap/issues/1382
