Bump curve25519-dalek from 4.1.2 to 4.1.3 (#307)

Bumps [curve25519-dalek](https://github.com/dalek-cryptography/curve25519-dalek) from 4.1.2 to 4.1.3.
- [Release notes](https://github.com/dalek-cryptography/curve25519-dalek/releases)
- [Commits](dalek-cryptography/curve25519-dalek@curve25519-4.1.2...curve25519-4.1.3)

---
updated-dependencies:
- dependency-name: curve25519-dalek
  dependency-type: indirect
...

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