chore(deps): require python-build in conda recipe

[jameslamb]

I saw conda builds in CI on #106 failing like this:

Traceback (most recent call last):
  File "/opt/conda/bin/conda-mambabuild", line 10, in <module>
 - python >=3.9
 - build

with channels:

The reported errors are:
- Encountered problems while solving:
-   - nothing provides requested build

Looks to me like this is due to the following set of circumstances:

• the conda package here has a dependency on build
• conda-forge stopped publishing it 2 years ago: https://github.com/conda-forge/build-feedstock

This fixes that by switching the dependency in the recipe from build to python-build.

Notes for Reviewers

I'm really not sure why this is just breaking now... the latest release of build at https://anaconda.org/conda-forge/build/files is a noarch package without any constraints that appear to conflict with other things we're installing here.

python-build is what we want either way, since it's being actively updated, but would be good to understand why this just broke now.

I checked across the rapidsai org and don't see any other cases where we were relying on the old build package: https://github.com/search?q=org%3Arapidsai+%22-+build%22+language%3AYAML+path%3Ameta.yaml&type=code

[vyasr]

Perhaps a Python version upper bound somewhere, combined with an upgrade to our containers? The original package seems like it's a noarch package, though.

[GPUtester]

🎉 This PR is included in version 1.15.0 🎉

The release is available on:

• GitHub release
• PyPI release
• Conda release - rapidsai
• Conda release - rapidsai-nightly

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