fix(image-generation): update model name

Author: msampathkumar

genai/image_generation/imggen_mmflash_edit_img_with_txt_img.py

@@ -26,7 +26,7 @@ def generate_content() -> str:
     image = Image.open("example-image.png")
 
     response = client.models.generate_content(
-        model="gemini-2.0-flash-preview-image-generation",
+        model="gemini-2.0-flash-exp",
         contents=[image, "Edit this image to make it look like a cartoon."],
         config=GenerateContentConfig(response_modalities=["Text", "Image"]),
     )

genai/image_generation/imggen_mmflash_txt_and_img_with_txt.py

@@ -23,7 +23,7 @@ def generate_content() -> int:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-2.0-flash-preview-image-generation",
+        model="gemini-2.0-flash-exp",
         contents=(
             "Generate an illustrated recipe for a paella."
             "Create images to go alongside the text as you generate the recipe"

genai/image_generation/imggen_mmflash_with_txt.py

@@ -23,7 +23,7 @@ def generate_content() -> str:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-2.0-flash-preview-image-generation",
+        model="gemini-2.0-flash-exp",
         contents=(
             "Generate an image of the Eiffel tower with fireworks in the background."
         ),