ci: Use 'strict' option for twine check

[matthewfeickert]

Description

Use twine check --strict to fail on warnings.

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

* Use `twine check --strict` to fail on warnings.

[codecov]

Codecov Report

Merging #1954 (060141b) into master (44a7814) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1954   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          69       69           
  Lines        4439     4439           
  Branches      748      748           
=======================================
  Hits         4362     4362           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	25.81% <ø> (ø)
doctest	61.02% <ø> (ø)
unittests-3.10	96.14% <ø> (ø)
unittests-3.7	96.13% <ø> (ø)
unittests-3.8	96.17% <ø> (ø)
unittests-3.9	96.19% <ø> (ø)

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