build(deps): bump once_cell from 1.5.0 to 1.5.1
Bumps [once_cell](https://github.com/matklad/once_cell) from 1.5.0 to 1.5.1.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.5.0...v1.5.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
dependabot-preview[bot]