CompatHelper: add new compat entry for Sundials at version 4 for package docs, (keep existing compat)

[github-actions[bot]]

This pull request sets the compat entry for the Sundials package to 4 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-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.79%. Comparing base (2fbf586) to head (f68fcd0).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #217 +/- ## ========================================== - Coverage 90.85% 90.79% -0.06% ========================================== Files 61 61 Lines 3891 3891 ========================================== - Hits 3535 3533 -2 - Misses 356 358 +2 ```

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