Fix pyproject.toml tools -> tool.

[bdice]

Description

There is a typo in pyproject.toml. It should be [tool.setuptools...] instead of [tools.setuptools...].

A warning is issued when building (observed with Python 3.12 and pip 25.0):

/tmp/build-env-vzednt84/lib/python3.12/site-packages/setuptools/config/pyprojecttoml.py:72: _ToolsTypoInMetadata: Ignoring [tools.setuptools] in pyproject.toml, did you mean [tool.setuptools]?

Checklist:

• I am familiar with the Contributing Guidelines.
• I agree with the terms of the Contributor Agreement.
• My name is on the list of contributors.
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• The package documentation and framework documentation in signac-docs are up to date with these changes.
• I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.24%. Comparing base (4db7429) to head (27c13ac).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1020   +/-   ##
=======================================
  Coverage   86.24%   86.24%           
=======================================
  Files          20       20           
  Lines        3503     3503           
  Branches      662      662           
=======================================
  Hits         3021     3021           
  Misses        331      331           
  Partials      151      151           

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