CompatHelper: bump compat for EinExprs in [weakdeps] to 0.7, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the EinExprs package from 0.6.4 to 0.6.4, 0.7.
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 77.39%. Comparing base (ea0f467) to head (6729c83).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #240   +/-   ##
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  Coverage   77.39%   77.39%           
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  Files          77       77           
  Lines        3805     3805           
=======================================
  Hits         2945     2945           
  Misses        860      860           

Flag	Coverage Δ
docs	0.00% <ø> (ø)

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