build(deps): bump curve25519-dalek from 4.1.1 to 4.1.2

Bumps [curve25519-dalek](https://github.com/dalek-cryptography/curve25519-dalek) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/dalek-cryptography/curve25519-dalek/releases)
- [Commits](dalek-cryptography/curve25519-dalek@curve25519-4.1.1...curve25519-4.1.2)

---
updated-dependencies:
- dependency-name: curve25519-dalek
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]