fix: update Replicate example to use Bearer auth and include version

- Change Authorization header from 'Token' to 'Bearer' prefix
- Add version field to request body with anthropic/claude-4.5-haiku example
- These changes reflect the actual working implementation

Author: zeke

src/content/docs/ai-gateway/usage/providers/replicate.mdx

@@ -30,9 +30,10 @@ When making requests to Replicate, ensure you have the following:
 
 ```bash title="Request"
 curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/replicate/predictions \
-  --header 'Authorization: Token {replicate_api_token}' \
+  --header 'Authorization: Bearer {replicate_api_token}' \
   --header 'Content-Type: application/json' \
   --data '{
+    "version": "anthropic/claude-4.5-haiku",
     "input":
       {
         "prompt": "What is Cloudflare?"