build: increment version to 0.2.4

Author: yangkyeongmo

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mcp-server-apache-airflow"
-version = "0.2.3"
+version = "0.2.4"
 description = "Model Context Protocol (MCP) server for Apache Airflow"
 authors = [
     { name = "Gyeongmo Yang", email = "[email protected]" }