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

Bumps `mcp-kotlin` from 0.12.0 to 0.13.0.

Updates `io.modelcontextprotocol:kotlin-sdk-client` from 0.12.0 to 0.13.0
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](0.12.0...0.13.0)

Updates `io.modelcontextprotocol:kotlin-sdk-server` from 0.12.0 to 0.13.0
- [Release notes](https://github.com/modelcontextprotocol/kotlin-sdk/releases)
- [Commits](0.12.0...0.13.0)

---
updated-dependencies:
- dependency-name: io.modelcontextprotocol:kotlin-sdk-client
  dependency-version: 0.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.modelcontextprotocol:kotlin-sdk-server
  dependency-version: 0.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

samples/weather-stdio-server/gradle/libs.versions.toml

@@ -3,7 +3,7 @@ coroutines = "1.11.0"
 kotlin = "2.3.21"
 ktor = "3.3.3"
 logging = "8.0.4"
-mcp-kotlin = "0.12.0"
+mcp-kotlin = "0.13.0"
 shadow = "9.4.2"
 slf4j = "2.0.18"