Bump backoff from 1.11.0 to 1.11.1 (#346)

Bumps [backoff](https://github.com/litl/backoff) from 1.11.0 to 1.11.1.
- [Release notes](https://github.com/litl/backoff/releases)
- [Changelog](https://github.com/litl/backoff/blob/master/CHANGELOG.md)
- [Commits](litl/backoff@v1.11.0...v1.11.1)

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

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Author: dependabot[bot]