CompatHelper: add new compat entry for StableRNGs at version 1 for package docs, (keep existing compat)

[github-actions]

This pull request sets the compat entry for the StableRNGs package to 1 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.
Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.90%. Comparing base (abc7057) to head (03b77fa).
Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (abc7057) and HEAD (03b77fa). Click for more details.

HEAD has 56 uploads less than BASE

Flag	BASE (abc7057)	HEAD (03b77fa)
	61	5

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #881       +/-   ##
===========================================
- Coverage   93.98%   33.90%   -60.09%     
===========================================
  Files          57       57               
  Lines        2793     2761       -32     
===========================================
- Hits         2625      936     -1689     
- Misses        168     1825     +1657     

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