Bump syn from 2.0.71 to 2.0.72 in /src/_bcrypt (#837)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.71 to 2.0.72.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.71...2.0.72)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]