Update goblin dependency to 0.9

[musicinmybrain]

Update the dependency on goblin from 0.6 to 0.9.

The trivial use of this crate in a test for libbpf-cargo is not affected by any of the documented breaking changes between these releases.

Furthermore, running cargo test in libbpf-cargo/ still works.

[danielocfb]

Looks good to me, thanks! In the future, please change related functionality in a single commit. There is no reason to have two commits here and it can cause issue when bisecting, for example, because the Cargo.lock file will be regenerated and have untracked changes.