CompatHelper: bump compat for AdvancedHMC to 0.8 for package 0-intro-1d, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the AdvancedHMC package from 0.4, 0.5, 0.6, 0.7 to 0.4, 0.5, 0.6, 0.7, 0.8 for package 0-intro-1d.
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 96.21%. Comparing base (4009b3c) to head (319d1db).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #429       +/-   ##
==========================================
+ Coverage   0.26%   96.21%   +95.95%     
==========================================
  Files         12       12               
  Lines        382      396       +14     
==========================================
+ Hits           1      381      +380     
+ Misses       381       15      -366     

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