fix: make render_loop Send again

[ccbrown]

What It Does

Makes the future returned by render_loop Send.

Related Issues

Fixes #150

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.99%. Comparing base (a1e1f0e) to head (2821fc9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
+ Coverage   89.98%   89.99%   +0.01%     
==========================================
  Files          31       31              
  Lines        5192     5198       +6     
  Branches     5192     5198       +6     
==========================================
+ Hits         4672     4678       +6     
  Misses        419      419              
  Partials      101      101              

Files with missing lines	Coverage Δ
packages/iocraft/src/element.rs	79.24% <100.00%> (+0.60%)	⬆️

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