deps: bump rmcp from 1.2.0 to 1.3.0

Bumps [rmcp](https://github.com/modelcontextprotocol/rust-sdk) from 1.2.0 to 1.3.0.
- [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-v1.2.0...rmcp-v1.3.0)

---
updated-dependencies:
- dependency-name: rmcp
  dependency-version: 1.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -27,7 +27,7 @@ ignore = "0.4"
 lsp-types = "0.97"
 mcpls-core = { path = "crates/mcpls-core", version = "0.3.5" }
 predicates = "3.1"
-rmcp = "1.2"
+rmcp = "1.3"
 rstest = "0.26"
 schemars = "1.2"
 serde = "1.0"