fix: correct typing for task results methods

[AbeCoull]

Issue #, if available:

Description of changes:
Corrects the return type and docstring for these methods.

Testing done:

Merge Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (36e32f6) to head (16426c1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #1039    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          135       135            
  Lines         9033      9033            
  Branches      2029      1037   -992     
==========================================
  Hits          9033      9033            

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