Bump pin-project from 0.4.15 to 0.4.16

Bumps [pin-project](https://github.com/taiki-e/pin-project) from 0.4.15 to 0.4.16.
- [Release notes](https://github.com/taiki-e/pin-project/releases)
- [Changelog](https://github.com/taiki-e/pin-project/blob/master/CHANGELOG.md)
- [Commits](taiki-e/pin-project@v0.4.15...v0.4.16)

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