fix(xai): update default Grok model

Author: Jeadie

models/xai/spicepod.yaml

@@ -3,7 +3,7 @@ kind: Spicepod
 name: xai
 
 models:
-  - from: xai:grok-4-1-fast-non-reasoning
+  - from: xai:grok-4.3
     name: xai
     params:
       xai_api_key: ${secrets:SPICE_XAI_API_KEY}