deps(deps): bump io.modelcontextprotocol:kotlin-sdk from 0.8.1 to 0.8.4

Bumps [io.modelcontextprotocol:kotlin-sdk](https://github.com/modelcontextprotocol/kotlin-sdk) from 0.8.1 to 0.8.4.
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](modelcontextprotocol/kotlin-sdk@0.8.1...0.8.4)

---
updated-dependencies:
- dependency-name: io.modelcontextprotocol:kotlin-sdk
  dependency-version: 0.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 kotlin = "2.3.0"
 
 # MCP SDK
-mcp-sdk = "0.8.1"
+mcp-sdk = "0.9.0"
 kotlinx-io = "0.8.2"