chore(deps-dev): Bump sabre/dav in /tests/Integration

Bumps [sabre/dav](https://github.com/sabre-io/dav) from 4.5.1 to 4.6.0.
- [Release notes](https://github.com/sabre-io/dav/releases)
- [Changelog](https://github.com/sabre-io/dav/blob/master/CHANGELOG.md)
- [Commits](sabre-io/dav@4.5.1...4.6.0)

---
updated-dependencies:
- dependency-name: sabre/dav
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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