Bump mcp from 1.6.1 to 1.8.0

Bumps [mcp](https://github.com/modelcontextprotocol/ruby-sdk) from 1.6.1 to 1.8.0.
- [Release notes](https://github.com/modelcontextprotocol/ruby-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/ruby-sdk/blob/main/CHANGELOG.md)
- [Commits](modelcontextprotocol/ruby-sdk@v1.6.1...v1.8.0)

---
updated-dependencies:
- dependency-name: mcp
  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]

Gemfile.lock

@@ -136,7 +136,7 @@ GEM
       net-pop
       net-smtp
     marcel (1.2.1)
-    mcp (1.6.1)
+    mcp (1.8.0)
       json_schemer (>= 2.4)
     mini_mime (1.1.5)
     mini_portile2 (2.8.9)
@@ -240,7 +240,7 @@ GEM
       prism (>= 1.6.0)
       rbs (>= 4.0.0)
       tsort
-    regexp_parser (2.13.0)
+    regexp_parser (2.13.1)
     reline (0.7.0)
       io-console (~> 0.5)
     rexml (3.4.4)