Bump classindex from 3.4 to 3.9
Bump classindex from 3.4 to 3.9

Bumps [classindex](https://github.com/atteo/classindex) from 3.4 to 3.9.
- [Release notes](https://github.com/atteo/classindex/releases)
- [Changelog](https://github.com/atteo/classindex/blob/master/CHANGES.md)
- [Commits](https://github.com/atteo/classindex/compare/3.4...3.9)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Panda-Programming-Language/Panda