CompatHelper: bump compat for Zygote to 0.7, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Zygote package from 0.6.67 to 0.6.67, 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.

[mcabbott]

Closing in favour of #2574

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.46%. Comparing base (101106e) to head (a0cabd8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2575      +/-   ##
==========================================
- Coverage   32.50%   32.46%   -0.04%     
==========================================
  Files          34       33       -1     
  Lines        2003     2002       -1     
==========================================
- Hits          651      650       -1     
  Misses       1352     1352              

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