chore(deps): update rust crate smallvec to 1.9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
smallvec	dependencies	minor	1.8 -> 1.9

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Release Notes

servo/rust-smallvec

### [`v1.9.0`](https://togithub.com/servo/rust-smallvec/releases/tag/v1.9.0) [Compare Source](https://togithub.com/servo/rust-smallvec/compare/v1.8.1...v1.9.0) - Add `retain_mut` as an alias for `retain`, for compatibility with `std::vec::Vec` ([#​283](https://togithub.com/servo/rust-smallvec/issues/283)). ### [`v1.8.1`](https://togithub.com/servo/rust-smallvec/releases/tag/v1.8.1) [Compare Source](https://togithub.com/servo/rust-smallvec/compare/v1.8.0...v1.8.1) - Optimize inserts at the end of the vector ([#​282](https://togithub.com/servo/rust-smallvec/issues/282)). - Fix possible aliasing issues with raw pointers ([#​277](https://togithub.com/servo/rust-smallvec/issues/277)). - Fix format of license field in Cargo manifest ([#​278](https://togithub.com/servo/rust-smallvec/issues/278)).

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[github-actions[bot]]

:tada: This issue has been resolved in version 4.0.0 :tada: