CompatHelper: bump compat for StatsFuns to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the StatsFuns package from 1 to 1, 2.
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 64.94%. Comparing base (2b3c79c) to head (88a737a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #351   +/-   ##
=======================================
  Coverage   64.94%   64.94%           
=======================================
  Files          24       24           
  Lines        1432     1432           
=======================================
  Hits          930      930           
  Misses        502      502           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.