chore(deps): bump ed25519 from 2.2.0 to 2.2.1

Bumps [ed25519](https://github.com/RustCrypto/signatures) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/RustCrypto/signatures/releases)
- [Commits](RustCrypto/signatures@ed25519/v2.2.0...ed25519/v2.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

crypto/keys/Cargo.toml

@@ -20,7 +20,7 @@ base64 = { version = "0.21", default-features = false }
 curve25519-dalek = { version = "4.0.0-rc.1", default-features = false, features = ["rand_core"] }
 digest = "0.10"
 displaydoc = { version = "0.2", default-features = false }
-ed25519 = { version = "2.2.0", default-features = false }
+ed25519 = { version = "2.2.1", default-features = false }
 ed25519-dalek = { version = "2.0.0-pre.0", default-features = false, features = ["rand_core", "digest"] }
 hex = { version = "0.4", default-features = false }
 hex_fmt = "0.3"