Bump obstore from 0.6.0 to 0.8.1

Bumps [obstore](https://github.com/developmentseed/obstore) from 0.6.0 to 0.8.1.
- [Release notes](https://github.com/developmentseed/obstore/releases)
- [Changelog](https://github.com/developmentseed/obstore/blob/main/CHANGELOG.md)
- [Commits](developmentseed/obstore@py-v0.6.0...py-v0.8.1)

Author: weiji14