Bump smallvec from 1.15.0 to 1.15.1 (#200)

Bumps [smallvec](https://github.com/servo/rust-smallvec) from 1.15.0 to 1.15.1.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](servo/rust-smallvec@v1.15.0...v1.15.1)

---
updated-dependencies:
- dependency-name: smallvec
  dependency-version: 1.15.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]