feat: add Python version 3.12 to Agent Engine

PiperOrigin-RevId: 736922909

Author: yeesian

vertexai/agent_engines/_agent_engines.py

@@ -47,7 +47,7 @@
 
 
 _LOGGER = _utils.LOGGER
-_SUPPORTED_PYTHON_VERSIONS = ("3.8", "3.9", "3.10", "3.11")
+_SUPPORTED_PYTHON_VERSIONS = ("3.8", "3.9", "3.10", "3.11", "3.12")
 _DEFAULT_GCS_DIR_NAME = "agent_engine"
 _BLOB_FILENAME = "agent_engine.pkl"
 _REQUIREMENTS_FILE = "requirements.txt"