chore(deps): bump rmcp from 1.7.0 to 2.0.0

Bumps [rmcp](https://github.com/modelcontextprotocol/rust-sdk) from 1.7.0 to 2.0.0.
- [Release notes](https://github.com/modelcontextprotocol/rust-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/rust-sdk/blob/main/release-plz.toml)
- [Commits](modelcontextprotocol/rust-sdk@rmcp-v1.7.0...rmcp-v2.0.0)

---
updated-dependencies:
- dependency-name: rmcp
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -14,7 +14,7 @@ name = "echidna-mcp"
 path = "src/main.rs"
 
 [dependencies]
-rmcp        = { version = "1", features = ["server", "macros", "transport-io"] }
+rmcp        = { version = "2", features = ["server", "macros", "transport-io"] }
 serde       = { version = "1", features = ["derive"] }
 serde_json  = "1"
 schemars    = "1"