CompatHelper: bump compat for TensorAlgebra to 0.20 for package test, (keep existing compat)

[ITensorBot]

This pull request changes the compat entry for the TensorAlgebra package from 0.18 to 0.18, 0.20 for package test.
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 77.86%. Comparing base (5e9266b) to head (2c7c948).

Additional details and impacted files

@@ Coverage Diff @@## main #246 +/- ##
=======================================
Coverage 77.86% 77.86% =======================================
Files 30 30 Lines 1812 1812 =======================================
Hits 1411 1411 Misses 401 401 

Flag	Coverage Δ
docs	26.22% <ø> (ø)

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