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

[github-actions]

This pull request changes the compat entry for the AdvancedHMC package from 0.5, 0.6 to 0.5, 0.6, 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 50.08%. Comparing base (c781586) to head (590a45c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #469   +/-   ##
=======================================
  Coverage   50.08%   50.08%           
=======================================
  Files         122      122           
  Lines        5872     5872           
=======================================
  Hits         2941     2941           
  Misses       2931     2931           

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[oschulz]

@Micki-D , can you take a look at this and check if there are any breaking changes in AdvancedHMC v0.7 that we need to adapt to?