fix(js/samples/js-coffee-shop): update model so that the sample works

ERROR:

```
[GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent: [404 Not Found] models/gemini-1.5-flash is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.
Error: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent: [404 Not Found] models/gemini-1.5-flash is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.
...
```

CHANGELOG:
- [ ] Fixes the use of the model so the sample works.

Author: yesudeep

samples/js-coffee-shop/package.json

@@ -17,20 +17,20 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "genkit": "^1.0.4",
-    "genkitx-chromadb": "^1.0.4",
-    "@genkit-ai/dev-local-vectorstore": "^1.0.4",
-    "@genkit-ai/firebase": "^1.0.4",
-    "@genkit-ai/googleai": "^1.0.4",
-    "genkitx-ollama": "^1.0.4",
-    "genkitx-pinecone": "^1.0.4",
-    "@genkit-ai/evaluator": "^1.0.4",
-    "@genkit-ai/vertexai": "^1.0.4",
-    "zod": "^3.22.4"
+    "@genkit-ai/dev-local-vectorstore": "1.21.0",
+    "@genkit-ai/evaluator": "1.21.0",
+    "@genkit-ai/firebase": "1.21.0",
+    "@genkit-ai/google-genai": "1.21.0",
+    "@genkit-ai/vertexai": "^1.21.0",
+    "genkit": "1.21.0",
+    "genkitx-chromadb": "1.21.0",
+    "genkitx-ollama": "1.21.0",
+    "genkitx-pinecone": "^1.21.0",
+    "zod": "^4.1.12"
   },
   "devDependencies": {
-    "genkit-cli": "^1.0.4",
+    "genkit-cli": "^1.21.0",
     "rimraf": "^6.0.1",
-    "typescript": "^5.3.3"
+    "typescript": "^5.9.3"
   }
 }

samples/js-coffee-shop/src/index.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { gemini15Flash, googleAI } from '@genkit-ai/googleai';
+import { googleAI } from '@genkit-ai/google-genai';
 import { genkit, z } from 'genkit';
 
 const ai = genkit({
@@ -33,7 +33,7 @@ const CustomerNameSchema = z.object({
 const simpleGreetingPrompt = ai.definePrompt(
   {
     name: 'simpleGreeting',
-    model: gemini15Flash,
+    model: googleAI.model('gemini-2.5-flash'),
     input: { schema: CustomerNameSchema },
     output: {
       format: 'text',
@@ -68,7 +68,7 @@ const CustomerTimeAndHistorySchema = z.object({
 const greetingWithHistoryPrompt = ai.definePrompt(
   {
     name: 'greetingWithHistory',
-    model: gemini15Flash,
+    model: googleAI.model('gemini-2.5-flash'),
     input: { schema: CustomerTimeAndHistorySchema },
     output: {
       format: 'text',