build(deps): Bump rmcp from 1.8.0 to 2.1.0

Bumps [rmcp](https://github.com/modelcontextprotocol/rust-sdk) from 1.8.0 to 2.1.0.
- [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-v1.8.0...rmcp-v2.1.0)

---
updated-dependencies:
- dependency-name: rmcp
  dependency-version: 2.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.lock

@@ -120,7 +120,7 @@ whoami = "2.1.0"
 fnv_rs = "0.4.3"
 merge = { version = "0.2", features = ["derive"] }
 hex = "0.4.3"
-rmcp = { version = "1.0.0", features = [
+rmcp = { version = "2.1.0", features = [
     "client",
     "transport-child-process",
     "transport-streamable-http-client-reqwest",