Bump merlin from 2.0.0 to 3.0.0

Bumps [merlin](https://github.com/zkcrypto/merlin) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/zkcrypto/merlin/releases)
- [Changelog](https://github.com/zkcrypto/merlin/blob/main/CHANGELOG.md)
- [Commits](zkcrypto/merlin@2.0.0...3.0.0)

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

Author: dependabot[bot]

Diff for: Cargo.lock

@@ -14,7 +14,7 @@ crate-type = ["cdylib", "staticlib"]
 schnorrkel = { version="0.9.1", features = ["preaudit_deprecated"] }
 ed25519-dalek = { version="1.0.0" }
 rand_chacha = "0.2.2"
-merlin = { version = "2.0", default-features = false }
+merlin = { version = "3.0", default-features = false }
 
 [dev-dependencies]
 hex-literal = "0.3.1"