Update Pixi build customization example (#12499)
Hey! Was very happy to find a pixi example (thanks @pavelzw from #12155
:)) )
The example as it is though is broken saying "Missing configuration
option At least one of the following configuration options is required:
build.tools or build.commands." .
Adding
```diff
+ tools:
+ python: "latest"
```
does placate the error message, but this doesn't really make sense since
Pixi manages its own Python.
Can we update the example linking to a relevant issue if there is one?
---------
Co-authored-by: Manuel Kaufmann <humitos@gmail.com>
