CompatHelper: bump compat for GR to 0.73 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GR package from 0.72.1 to 0.72.1, 0.73 for package docs.
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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e231ed) 85.98% compared to head (2b48c3b) 85.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1811   +/-   ##
=======================================
  Coverage   85.98%   85.98%           
=======================================
  Files         144      144           
  Lines        8648     8648           
=======================================
  Hits         7436     7436           
  Misses       1212     1212           

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