test(cli): reduce flakiness of spinner test

[kt3k]

ref https://github.com/denoland/deno_std/actions/runs/9058079848/job/24883108851

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.44%. Comparing base (8c87b7f) to head (c746531).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4719      +/-   ##
==========================================
- Coverage   91.44%   91.44%   -0.01%     
==========================================
  Files         480      480              
  Lines       37324    37324              
  Branches     5320     5320              
==========================================
- Hits        34132    34130       -2     
- Misses       3136     3138       +2     
  Partials       56       56              

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