build: Remove wheel and attrs from build-system requires

[matthewfeickert]

Description

Resolves #1787

As noted by @henryiii in scikit-hep/pylhe#111, neither wheel or attrs are needed.

• Remove wheel from build-system requires as it is declared by PEP 517's get_requires_for_build_sdist and so already covered.
  • c.f. https://www.python.org/dev/peps/pep-0517/
• Remove attrs as not required at build time.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Remove wheel from build-system requires as it is declared by
PEP 517's get_requires_for_build_sdist and so already covered.
   - c.f. https://www.python.org/dev/peps/pep-0517/
* Remove attrs as not required at build time.

[matthewfeickert]

@henryiii In scikit-hep/boost-histogram#394 you bumped the setuptools_scm lower bound to setuptools_scm[toml]>=4.1.2 but have it still as setuptools_scm[toml]>=3.4 in hist. Is there a particular reason for the newer version in boost-histogram that we should be updating the lower bounds for as well?

[codecov]

Codecov Report

Merging #1788 (8feb160) into master (7428bed) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1788   +/-   ##
=======================================
  Coverage   98.12%   98.12%           
=======================================
  Files          64       64           
  Lines        4270     4270           
  Branches      683      683           
=======================================
  Hits         4190     4190           
  Misses         46       46           
  Partials       34       34           

Flag	Coverage Δ
contrib	26.25% <ø> (ø)
doctest	60.58% <ø> (ø)
unittests	96.18% <ø> (ø)

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[matthewfeickert]

I'm going to merge this in and just make another PR later if Henry has advice on changing setuptools_scm[toml] lower bounds.

[matthewfeickert]

I think I made an error when I made the commit message. This is covered (I think) by get_requires_for_build_wheel not get_requires_for_build_sdist.