SG-42503 Packaging for v3.10.2

[jay-roe]

This pull request prepares for the next release of the Flow Production Tracking Python API by updating the version to 3.10.2 and updates the bundled certifi package to address version consistency and potential security improvements across the Python API. The changes ensure that the latest version of certifi (2026.5.20) is used throughout the codebase.

Dependency update:

• Updated certifi to version 2026.5.20 in shotgun_api3/lib/requirements.txt and the internal version reference in shotgun_api3/lib/certifi/__init__.py for consistency and security.

Added utility script:

• Added update_certifi.py to facilitate updating the certifi package, following the similar pattern in update_httplib2.py. (In the future, we may want to run this automatically when certifi releases a new version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.66%. Comparing base (921114c) to head (a248ca2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #448   +/-   ##
=======================================
  Coverage   78.66%   78.66%           
=======================================
  Files           7        7           
  Lines        1842     1842           
=======================================
  Hits         1449     1449           
  Misses        393      393           

Flag	Coverage Δ
Linux	78.66% <100.00%> (ø)
Python-3.10	78.61% <100.00%> (ø)
Python-3.11	78.61% <100.00%> (ø)
Python-3.13	78.61% <100.00%> (ø)
Python-3.9	78.59% <100.00%> (ø)
Windows	78.75% <100.00%> (ø)
macOS	78.66% <100.00%> (ø)

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