CompatHelper: bump compat for OrderedCollections to 2, (keep existing compat)

[ITensorBot]

This pull request changes the compat entry for the OrderedCollections package from 1.6 to 1.6, 2.
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 72.97%. Comparing base (5da084a) to head (478da1b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files          20       20           
  Lines        1051     1051           
=======================================
  Hits          767      767           
  Misses        284      284           

Flag	Coverage Δ
docs	26.31% <ø> (ø)

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