chore: fix type for hello message constant

[bdraco]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (6dca98d) to head (ecdbd0a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #407      +/-   ##
==========================================
+ Coverage   84.36%   84.47%   +0.11%     
==========================================
  Files          29       29              
  Lines        3389     3389              
  Branches      598      598              
==========================================
+ Hits         2859     2863       +4     
+ Misses        331      327       -4     
  Partials      199      199              

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[codspeed-hq]

CodSpeed Performance Report

Merging #407 will not alter performance

_{Comparing hello_type (ecdbd0a) with main (ed38f69)}

Summary

✅ 3 untouched benchmarks