Bump once_cell from 1.15.0 to 1.16.0 in /src/_bcrypt (#451)

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.15.0 to 1.16.0.
- [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/v1.15.0...v1.16.0

)

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

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