Cleanup test dependencies

[ogauthe]

• remove outdated GradedUnitRanges dependency in tests
• update TensorOperations version
• remove outdated TODO.md (may also keep empty file)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.18%. Comparing base (09e8aff) to head (51c188b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   95.18%   95.18%           
=======================================
  Files          14       14           
  Lines         415      415           
=======================================
  Hits          395      395           
  Misses         20       20           

Flag	Coverage Δ
docs	0.00% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

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