build(deps-dev): bump mcp from 0.8.0 to 0.9.0 (#4946)

Bumps [mcp](https://github.com/modelcontextprotocol/ruby-sdk) from 0.8.0 to 0.9.0.
- [Release notes](https://github.com/modelcontextprotocol/ruby-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/ruby-sdk/blob/main/CHANGELOG.md)
- [Commits](modelcontextprotocol/ruby-sdk@v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 0.9.0
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -290,7 +290,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     machinist (1.0.6)
-    mcp (0.8.0)
+    mcp (0.9.0)
       json-schema (>= 4.1)
     method_source (1.1.0)
     mime-types (3.7.0)