test: fix tz-dependence in test_rfc_authors

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.59%. Comparing base (3cce873) to head (175e1f3).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11376      +/-   ##
==========================================
- Coverage   88.59%   88.59%   -0.01%     
==========================================
  Files         333      333              
  Lines       44669    44728      +59     
==========================================
+ Hits        39575    39626      +51     
- Misses       5094     5102       +8     

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