editoast: bump inventory from 0.3.15 to 0.3.16 in /editoast

Bumps [inventory](https://github.com/dtolnay/inventory) from 0.3.15 to 0.3.16.
- [Release notes](https://github.com/dtolnay/inventory/releases)
- [Commits](dtolnay/inventory@0.3.15...0.3.16)

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

Signed-off-by: dependabot[bot] <[email protected]>