test: Update deprecated emoji test

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
Passing a string emits a deprecation warning. Amended it to the non-deprecated variant.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.97%. Comparing base (0374079) to head (bd80d70).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10607      +/-   ##
==========================================
- Coverage   38.18%   37.97%   -0.22%     
==========================================
  Files         239      239              
  Lines       15563    15528      -35     
  Branches     1376     1374       -2     
==========================================
- Hits         5943     5896      -47     
- Misses       9605     9617      +12     
  Partials       15       15              

Flag	Coverage Δ
rest	85.85% <ø> (-1.52%)	⬇️

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