chore(deps): bump bollard from 0.19.2 to 0.20.1

Bumps [bollard](https://github.com/fussybeaver/bollard) from 0.19.2 to 0.20.1.
- [Release notes](https://github.com/fussybeaver/bollard/releases)
- [Changelog](https://github.com/fussybeaver/bollard/blob/master/RELEASE.md)
- [Commits](fussybeaver/bollard@v0.19.2...v0.20.1)

---
updated-dependencies:
- dependency-name: bollard
  dependency-version: 0.20.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]