Bump bollard from 0.19.1 to 0.19.3 (#449)

Bumps [bollard](https://github.com/fussybeaver/bollard) from 0.19.1 to 0.19.3.
- [Release notes](https://github.com/fussybeaver/bollard/releases)
- [Changelog](https://github.com/fussybeaver/bollard/blob/master/RELEASE.md)
- [Commits](fussybeaver/bollard@v0.19.1...v0.19.3)

---
updated-dependencies:
- dependency-name: bollard
  dependency-version: 0.19.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]