include Python constraints for pure-Python conda packages

[jameslamb]

The cuopt-sh-client and cuopt-server packages are pure Python.

However, their conda packages are not technically built as noarch: python because of some historical limitations in RAPIDS build workflows (to be addresses as part of rapidsai/build-planning#43).

As a result, 1 of those packages is published for each combination of (Python minor version, CPU architecture) supported by RAPIDS. See, for example, https://anaconda.org/nvidia/cuopt-server/files?version=25.05.00

For as long as we're doing that, those packages should have a constraint on python, so that (for example) only 1 package matches for a given (Python minor version, CPU architecture).

This does that.

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[rgsl888prabhu]

/ok to test

[jameslamb]

I think this is working the way we want it to:

 │ │ Finalized run dependencies (cuopt-server-25.05.00a35-py311_250530_0b6e1a6b):
 │ │ ╭──────────────────┬───────────────────────────────────────╮
 │ │ │ Name             ┆ Spec                                  │
 │ │ ╞══════════════════╪═══════════════════════════════════════╡
 │ │ │ Run dependencies ┆                                       │
...
 │ │ │ python           ┆                                       │
...
 │ │ │ python_abi       ┆ 3.11.* *_cp311 (RE of [host: python]) │
 │ │ ╰──────────────────┴───────────────────────────────────────╯

(build link)

[gforsyth]

🎉

[rgsl888prabhu]

/merge