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

[github-actions]

This pull request changes the compat entry for the Zygote package from 0.6 to 0.6, 0.7 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.

[penelopeysm]

This should run fine with the new version of Bijectors released (TuringLang/Bijectors.jl#358)

Edit: Oh, we're still blocked by LogDensityProblemsAD as well as DifferentiationInterface. OK then, this can wait.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.60%. Comparing base (14a0d8c) to head (4f39963).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #771   +/-   ##
=======================================
  Coverage   84.60%   84.60%           
=======================================
  Files          34       34           
  Lines        3832     3832           
=======================================
  Hits         3242     3242           
  Misses        590      590           

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[coveralls]

Pull Request Test Coverage Report for Build 13795371453

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 84.692%

---

Files with Coverage Reduction	New Missed Lines	%
src/varinfo.jl	3	82.82%

Totals
Change from base Build 13795330712:	0.0%
Covered Lines:	3242
Relevant Lines:	3828

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💛 - Coveralls