Bump once_cell from 1.19.0 to 1.20.0 in /autorust (#480)

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.19.0 to 1.20.0.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.19.0...v1.20.0)

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

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