build(deps): bump pbkdf2 from 0.7.3 to 0.7.4 (#337)

Bumps [pbkdf2](https://github.com/RustCrypto/password-hashes) from 0.7.3 to 0.7.4.
- [Release notes](https://github.com/RustCrypto/password-hashes/releases)
- [Commits](RustCrypto/password-hashes@pbkdf2-v0.7.3...pbkdf2-v0.7.4)

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