chore(deps): update rstest requirement from 0.26.1 to 0.27.0 (#1276)

Updates the requirements on [rstest](https://github.com/la10736/rstest) to permit the latest version.
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/la10736/rstest/compare/v0.26.1...v0.27.0)

---
updated-dependencies:
- dependency-name: rstest
  dependency-version: 0.27.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

crates/rmcp/Cargo.toml

@@ -215,7 +215,7 @@ tracing-subscriber = { version = "0.3", features = [
   "fmt",
 ] }
 async-trait = "0.1"
-rstest = "0.26.1"
+rstest = "0.27.0"
 [[test]]
 name = "test_tool_macros"
 required-features = ["server", "client"]