chore(deps): bump mcp-kotlin in /samples/kotlinlang-mcp-server

Bumps `mcp-kotlin` from 0.11.1 to 0.12.0.

Updates `io.modelcontextprotocol:kotlin-sdk-server` from 0.11.1 to 0.12.0
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](0.11.1...0.12.0)

Updates `io.modelcontextprotocol:kotlin-sdk-client` from 0.11.1 to 0.12.0
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](0.11.1...0.12.0)

Updates `io.modelcontextprotocol:kotlin-sdk-testing` from 0.11.1 to 0.12.0
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](0.11.1...0.12.0)

---
updated-dependencies:
- dependency-name: io.modelcontextprotocol:kotlin-sdk-client
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.modelcontextprotocol:kotlin-sdk-server
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.modelcontextprotocol:kotlin-sdk-testing
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

samples/kotlinlang-mcp-server/gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.3.21"
 ktor = "3.3.3"
-mcp-kotlin = "0.11.1"
+mcp-kotlin = "0.12.0"
 serialization = "1.10.0"
 coroutines = "1.10.2"
 logback = "1.5.32"