build(deps): bump ring-compat from 0.7.0 to 0.8.0 (#744)

Bumps [ring-compat](https://github.com/RustCrypto/ring-compat) from 0.7.0 to 0.8.0.
- [Changelog](https://github.com/RustCrypto/ring-compat/blob/master/CHANGELOG.md)
- [Commits](RustCrypto/ring-compat@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: ring-compat
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

ed25519/Cargo.toml

@@ -29,7 +29,7 @@ zeroize = { version = "1", optional = true, default-features = false }
 bincode = "1"
 ed25519-dalek = { version = "2", features = ["rand_core"] }
 hex-literal = "0.4"
-ring-compat = { version = "0.7", default-features = false, features = ["signature"] }
+ring-compat = { version = "0.8", default-features = false, features = ["signature"] }
 rand_core = { version = "0.6", features = ["std"] }
 
 [features]