Update import for get_agent_manager (#261)

* Update import for get_agent_manager

* Catch import failure of get_agent_manager for previous versions

custom_components/nodered/websocket.py

@@ -8,8 +8,16 @@
 from homeassistant.components import device_automation
 from homeassistant.components.conversation import (
     HOME_ASSISTANT_AGENT,
-    _get_agent_manager,
 )
+
+try:
+    from homeassistant.components.conversation import get_agent_manager
+except ImportError:
+    # _get_agent_manager was renamed to get_agent_manager in 2024.4.0
+    from homeassistant.components.conversation import (
+        _get_agent_manager as get_agent_manager,
+    )
+
 from homeassistant.components.conversation.default_agent import DefaultAgent
 from homeassistant.components.device_automation import DeviceAutomationType
 from homeassistant.components.device_automation.exceptions import (
@@ -342,7 +350,7 @@ def remove_trigger() -> None:
         _LOGGER.info(f"Sentence trigger removed: {sentences}")
 
     try:
-        default_agent = await _get_agent_manager(hass).async_get_agent(
+        default_agent = await get_agent_manager(hass).async_get_agent(
             HOME_ASSISTANT_AGENT
         )
         assert isinstance(default_agent, DefaultAgent)