cargo: bump once_cell from 1.20.1 to 1.20.2

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.20.1 to 1.20.2.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.20.1...v1.20.2)

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

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