CompatHelper: bump compat for QuantumClifford to 0.9, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the QuantumClifford package from 0.8.20 to 0.8.20, 0.9.
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 81.37%. Comparing base (269cff2) to head (e9d4643).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #112       +/-   ##
===========================================
+ Coverage   71.23%   81.37%   +10.13%     
===========================================
  Files          37       36        -1     
  Lines        1495     1278      -217     
===========================================
- Hits         1065     1040       -25     
+ Misses        430      238      -192     

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