fix(groq-llm): temperature type

this fix will resolve `TypeError: Object of type NotGiven is not JSON serializable`

Author: civilcoder55

.github/next-release/changeset-ed01d58d.md

@@ -0,0 +1,5 @@
+---
+"livekit-plugins-groq": patch
+---
+
+fix(groq-llm): temperature type (#2137)

livekit-plugins/livekit-plugins-groq/livekit/plugins/groq/services.py

@@ -22,7 +22,7 @@ def __init__(
         model: str | LLMModels = "llama-3.3-70b-versatile",
         api_key: NotGivenOr[str] = NOT_GIVEN,
         user: NotGivenOr[str] = NOT_GIVEN,
-        temperature: NotGivenOr[float] = NOT_GIVEN,
+        temperature: float | None = None,
         parallel_tool_calls: NotGivenOr[bool] = NOT_GIVEN,
         tool_choice: NotGivenOr[ToolChoice] = NOT_GIVEN,
         base_url: str | None = "https://api.groq.com/openai/v1",