Inverting Mixing matrix destroys spin information

[JaimeRZP]

quick fix to #355

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
py3.10	82.80% <100.00%> (+0.01%)	⬆️
py3.11	82.80% <100.00%> (?)
py3.12	82.77% <100.00%> (+0.01%)	⬆️
py3.13	82.40% <66.66%> (-0.07%)	⬇️
py3.9	82.83% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
heracles/twopoint.py	95.43% <100.00%> (+0.04%)	⬆️

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.