Fix save using an embedded model as a primary key

[art049]

Fixes #94

[github-actions]

🚀 Deployed on https://docs-preview-258--odmantic.netlify.app

[codecov]

Codecov Report

Merging #258 (49ee94c) into master (c0b46e7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #258   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         4130      4149   +19     
  Branches       678       682    +4     
=========================================
+ Hits          4130      4149   +19     

Flag	Coverage Δ
tests-3.10-4.4-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.10-5-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.10-6-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.7-4.4-standalone	91.36% <100.00%> (+0.04%)	⬆️
tests-3.7-5-standalone	91.36% <100.00%> (+0.04%)	⬆️
tests-3.7-6-standalone	91.36% <100.00%> (+0.04%)	⬆️
tests-3.8-4-replicaSet	98.89% <100.00%> (+<0.01%)	⬆️
tests-3.8-4.2-sharded	92.33% <100.00%> (+0.03%)	⬆️
tests-3.8-4.4-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.8-5-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.8-6-standalone	93.32% <100.00%> (+0.03%)	⬆️
tests-3.9-4.4-standalone	93.22% <100.00%> (+0.03%)	⬆️
tests-3.9-5-standalone	93.22% <100.00%> (+0.03%)	⬆️
tests-3.9-6-standalone	93.22% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
odmantic/engine.py	100.00% <100.00%> (ø)
tests/integration/test_embedded_model.py	100.00% <100.00%> (ø)

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