Fixed "Unknown Distribution Format" in PyPI publish action

[reinecke]

Fixed an issue where the PyPI publish would throw this error on release:

Checking dist/opentimelineio-0.18.0.tar.gz: PASSED
Checking dist/wheel-macos-14-cp310: ERROR    InvalidDistribution: Unknown distribution format:                      
         'wheel-macos-14-cp310'      

It appears that multi-matched artifacts would each extract to their own dir rather than merge flatly - so the wheel was in a subdir with the artifact name instead of directly in the dist dir.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.13%. Comparing base (fe9f406) to head (642f190).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1970   +/-   ##
=======================================
  Coverage   85.13%   85.13%           
=======================================
  Files         181      181           
  Lines       12783    12783           
  Branches     1206     1206           
=======================================
  Hits        10883    10883           
  Misses       1717     1717           
  Partials      183      183           

Flag	Coverage Δ
py-unittests	85.13% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fe9f406...642f190. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jhodges10]

Looks like it'll work to me! Let's give it a shot.