Bump quote from 1.0.18 to 1.0.19 in /src/_bcrypt (#350)

Bumps [quote](https://github.com/dtolnay/quote) from 1.0.18 to 1.0.19.
- [Release notes](https://github.com/dtolnay/quote/releases)
- [Commits](https://github.com/dtolnay/quote/compare/1.0.18...1.0.19

)

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

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