Fix aggregation pipeline kwargs

[munrojm]

Ensure hint is passed properly in the aggregation pipeline kwargs in the API

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (73f10f5) 87.78% compared to head (5dd4e88) 87.76%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #884      +/-   ##
==========================================
- Coverage   87.78%   87.76%   -0.02%     
==========================================
  Files          44       44              
  Lines        3611     3614       +3     
==========================================
+ Hits         3170     3172       +2     
- Misses        441      442       +1     

Files	Coverage Δ
src/maggma/api/resource/read_resource.py	82.14% <66.66%> (-0.43%)	⬇️

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