Add compat entry for SparseMatricesCOO

[MaxenceGollier]

@dpo

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.32%. Comparing base (753a97f) to head (5a1cf5b).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   73.71%   77.32%   +3.60%     
==========================================
  Files          22       24       +2     
  Lines         898      966      +68     
==========================================
+ Hits          662      747      +85     
+ Misses        236      219      -17     

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[dpo]

Thank you.