CompatHelper: bump compat for MatrixAlgebraKit to 0.3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the MatrixAlgebraKit package from 0.2 to 0.2, 0.3.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (bf41a6c) to head (77d1317).

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HEAD has 8 uploads less than BASE

Flag	BASE (bf41a6c)	HEAD (77d1317)
docs	3	1
	6	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #57       +/-   ##
==========================================
- Coverage   93.14%   0.00%   -93.15%     
==========================================
  Files          20      19        -1     
  Lines         832     819       -13     
==========================================
- Hits          775       0      -775     
- Misses         57     819      +762     

Flag	Coverage Δ
docs	0.00% <ø> (ø)

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[mtfishman]

This will require updating this package to use BlockSparseArrays.jl v0.10 (#59).