chore: add gemini-3-flash-preview to interaction model list

PiperOrigin-RevId: 845900557

Author: hkt74

google/genai/_interactions/types/model.py

@@ -31,6 +31,7 @@
         "gemini-2.5-flash-image-preview",
         "gemini-2.5-pro-preview-tts",
         "gemini-3-pro-preview",
+        "gemini-3-flash-preview",
     ],
     str,
 ]

google/genai/_interactions/types/model_param.py

@@ -33,6 +33,7 @@
         "gemini-2.5-flash-image-preview",
         "gemini-2.5-pro-preview-tts",
         "gemini-3-pro-preview",
+        "gemini-3-flash-preview",
     ],
     str,
 ]