Bumps [smallvec](https://github.com/servo/rust-smallvec) from 1.3.0 to 1.4.1.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](servo/rust-smallvec@v1.3.0...v1.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>