chore: deprecate usingPromise

[mroderick]

This PR deprecates usingPromise in preparation of merging #2644.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (9e3d58f) to head (012f573).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2651      +/-   ##
==========================================
+ Coverage   96.09%   96.10%   +0.01%     
==========================================
  Files          40       40              
  Lines        1945     1951       +6     
==========================================
+ Hits         1869     1875       +6     
  Misses         76       76              

Flag	Coverage Δ
unit	96.10% <100.00%> (+0.01%)	⬆️

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[mroderick]

This has been published to the npm registry as sinon@19.0.5