Fix tag-update workflow failing on every tag push

[ceblanton]

actions/checkout creates a local refs/tags/ ref for the triggering tag before the "Fetch tags" step runs git fetch --tags, which then rejects with "would clobber existing tag" since the fetch is not forced. Force the fetch so the workflow can proceed.

Describe your changes

Issue ticket number and link (if applicable)

Fixes #XXX (replace XXX with the issue number and GitHub will autolink the PR to the issue)

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.09%. Comparing base (959795f) to head (a57ab52).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #919   +/-   ##
=======================================
  Coverage   82.09%   82.09%           
=======================================
  Files          67       67           
  Lines        3736     3736           
=======================================
  Hits         3067     3067           
  Misses        669      669           

Flag	Coverage Δ
unittests	82.09% <ø> (ø)

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