Bump ed25519 from 1.5.0 to 1.5.2 (#1987)

Bumps [ed25519](https://github.com/RustCrypto/signatures) from 1.5.0 to 1.5.2.
- [Release notes](https://github.com/RustCrypto/signatures/releases)
- [Commits](RustCrypto/signatures@ed25519/v1.5.0...ed25519/v1.5.2)

---
updated-dependencies:
- dependency-name: ed25519
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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