Bump url from 2.3.0 to 2.3.1 in /cmd/zfs_object_agent (openzfs#748)

Bumps [url](https://github.com/servo/rust-url) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/servo/rust-url/releases)
- [Commits](servo/rust-url@v2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: url
  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>