fix: ensure proxy object tasks do not get garbage collected prematurely

[bdraco]

There was a task that did not have a strong reference held

fixes #388

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.44%. Comparing base (5068e41) to head (14eead0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #409      +/-   ##
==========================================
+ Coverage   84.24%   84.44%   +0.19%     
==========================================
  Files          28       28              
  Lines        3390     3394       +4     
  Branches      600      600              
==========================================
+ Hits         2856     2866      +10     
+ Misses        334      329       -5     
+ Partials      200      199       -1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #409 will not alter performance

_{Comparing proxy_task (14eead0) with main (5068e41)}

Summary

✅ 3 untouched benchmarks