Update Rust crate candid to 0.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
candid (source)	dependencies	minor	0.7.16 -> 0.8.0

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Release Notes

dfinity/candid

### [`v0.8.0`](https://togithub.com/dfinity/candid/blob/HEAD/Changelog.md#​2022-09-27-Rust-080) - Move `Principal` into this crate, no more re-export `ic-types` ### [`v0.7.17`](https://togithub.com/dfinity/candid/blob/HEAD/Changelog.md#​2022-09-22-Rust-0717) - Bump `ic-types` to `0.5` (fixing `lookup_path` for hash trees)

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