test: ensure author fields are actually changed by test

[jennifer-richards]

Fixes intermittent CI failure noted in #4911 (comment)

[codecov]

Codecov Report

Merging #4918 (43d3993) into main (bc1cba1) will increase coverage by 0.00%.
The diff coverage is 83.72%.

@@           Coverage Diff           @@
##             main    #4918   +/-   ##
=======================================
  Coverage   88.47%   88.47%           
=======================================
  Files         296      296           
  Lines       39795    39806   +11     
=======================================
+ Hits        35208    35219   +11     
  Misses       4587     4587           

Impacted Files	Coverage Δ
ietf/review/utils.py	89.57% <ø> (-0.03%)	⬇️
ietf/doc/utils.py	88.05% <77.77%> (-0.16%)	⬇️
ietf/doc/views_doc.py	91.18% <84.37%> (+0.40%)	⬆️
ietf/doc/models.py	88.16% <100.00%> (+0.01%)	⬆️
ietf/doc/templatetags/ballot_icon.py	84.82% <100.00%> (ø)
ietf/doc/views_search.py	88.81% <0.00%> (-0.83%)	⬇️
ietf/nomcom/utils.py	91.30% <0.00%> (-0.25%)	⬇️
ietf/person/utils.py	86.98% <0.00%> (+0.59%)	⬆️
ietf/group/utils.py	94.61% <0.00%> (+0.89%)	⬆️

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