build(deps): update ring requirement from 0.14 to 0.16

Updates the requirements on [ring](https://github.com/briansmith/ring) to permit the latest version.
- [Release notes](https://github.com/briansmith/ring/releases)
- [Commits](https://github.com/briansmith/ring/commits)

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

tendermint/Cargo.toml

@@ -38,7 +38,7 @@ hyper = { version = "0.10" }
 prost-amino = { version = "0.4.0" }
 prost-amino-derive = { version = "0.4.0" }
 rand_os = { version = "0.1" }
-ring = { version = "0.14" }
+ring = { version = "0.16" }
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1" }
 signatory = { version = "0.12", features = ["ed25519", "ecdsa"] }