Allow bzip2 0.6

Ben Beasleyrequested to merge
musicinmybrain/sequoia:bzip2-0.6 into main

This release switches to libbz2-rs-sys as the default bzip2 backend. This rust implementation does not export C symbols by default. There are otherwise no API changes.

https://github.com/trifectatechfoundation/bzip2-rs/releases/tag/v0.6.0

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