Bump arc-swap from 1.9.0 to 1.9.1 (#85)

Bumps [arc-swap](https://github.com/vorner/arc-swap) from 1.9.0 to 1.9.1.
- [Changelog](https://github.com/vorner/arc-swap/blob/master/CHANGELOG.md)
- [Commits](vorner/arc-swap@v1.9.0...v1.9.1)

---
updated-dependencies:
- dependency-name: arc-swap
  dependency-version: 1.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]