CompatHelper: bump compat for ExtendableSparse to 0.9, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the ExtendableSparse package from 0.8 to 0.8, 0.9. 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

Base: 84.48% // Head: 84.48% // No change to project coverage :thumbsup:

Coverage data is based on head (ac1e220) compared to base (9c6f559). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #41 +/- ## ======================================= Coverage 84.48% 84.48% ======================================= Files 18 18 Lines 2133 2133 ======================================= Hits 1802 1802 Misses 331 331 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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